Display device

ABSTRACT

A display device is disclosed. The display device includes a housing, a roller located within the housing, a display panel having a front surface for displaying a screen and a back surface facing the front surface, the display panel being wound on the roller, and a plate wound on the roller, and coupled to back surface of the display panel, the plate having an opening.

Pursuant to 35 U.S.C. § 119(a), this application claims the benefit ofearlier filing date and right of priority to Korean Patent ApplicationNo. 10-2017-0123638, filed on Sep. 25, 2017, the contents of which arehereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

Embodiments of the invention relate to a display device.

Discussion of the Related Art

As the information society develops, demand for display devices isincreasing in various forms. Recently, in response to this, variousdisplay devices such as a liquid crystal display (LCD), a plasma displaypanel (PDP), an electro luminescent display (ELD), and a vacuumfluorescent display (VFD) have been studied and used.

Among them, a display device using an organic light emitting diode(OLED) has an advantage that it has excellent luminance characteristicsand viewing angle characteristics compared to the liquid crystaldisplay. Since the display device does not require a backlight unit, thedisplay device has an advantage that it can be implemented as anultra-thin type.

SUMMARY OF THE INVENTION

In one aspect, there is provided a display device including a housing, aroller located within the housing, a display panel having a frontsurface for displaying a screen and a back surface facing the frontsurface, the display panel being wound on the roller, and a plate woundon the roller, and coupled to back surface of the display panel, theplate having an opening.

The plate may include a metal material.

The plate may include a plurality of holes, and the plurality of holesmay be spaced along a longitudinal direction of the roller.

The plate may include a plurality of holes, and the plurality of holesmay be spaced along a direction in which the plate is wound on theroller.

The plate may include a plurality of holes, and the plurality of holesmay be spaced along a direction perpendicular to the longitudinaldirection of the roller.

The plurality of holes may be slits which are elongated along thelongitudinal direction of the roller.

The display device may further include an adhesive layer formed on theback surface of the display panel. The plate may be attached to theadhesive layer.

The plate may include a second front surface attached to the backsurface of the display panel and a second back surface facing the secondfront surface. The second back surface may contact an outercircumference surface of the roller.

The front surface of the display panel may contact an outercircumference surface of the roller.

The plate may include a front surface coupled to the back surface of thedisplay panel and a back surface facing the front surface. The displaydevice may further include a first resin layer coupled to the backsurface.

The first resin layer may include a portion located at the opening ofthe plate.

The plate may be accommodated in the first resin layer.

The display panel may be accommodated in the first resin layer.

The display device may further include a second resin layer coupled tothe back surface of the display panel. The plate may be disposed betweenthe first resin layer and the second resin layer.

The first resin layer may include a material of urethane or rubber.

The display device may further include a third resin layer coupled tothe back surface of the display panel. The plate may be accommodated inthe third resin layer.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention. In the drawings:

FIGS. 1 to 18 are views illustrating configuration of a display devicerelated to the invention;

FIGS. 19 to 34 are views illustrating a display device according to anembodiment of the invention;

FIGS. 35 to 57 are views illustrating a display device according toanother embodiment of the invention; and

FIGS. 58 to 88 are views illustrating a display device according to theother embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail embodiments of the inventionexamples of which are illustrated in the accompanying drawings. Sincethe invention may be modified in various ways and may have variousforms, specific embodiments are illustrated in the drawings and aredescribed in detail in the present specification. However, it should beunderstood that the invention are not limited to specific disclosedembodiments, but include all modifications, equivalents and substitutesincluded within the spirit and technical scope of the invention.

The terms ‘first’, ‘second’, etc. may be used to describe variouscomponents, but the components are not limited by such terms. The termsare used only for the purpose of distinguishing one component from othercomponents. For example, a first component may be designated as a secondcomponent without departing from the scope of the invention. In the samemanner, the second component may be designated as the first component.

The term “and/or” encompasses both combinations of the plurality ofrelated items disclosed and any item from among the plurality of relateditems disclosed.

When an arbitrary component is described as “being connected to” or“being linked to” another component, this should be understood to meanthat still another component(s) may exist between them, although thearbitrary component may be directly connected to, or linked to, thesecond component. In contrast, when an arbitrary component is describedas “being directly connected to” or “being directly linked to” anothercomponent, this should be understood to mean that no component existsbetween them.

The terms used in the present application are used to describe onlyspecific embodiments or examples, and are not intended to limit theinvention. A singular expression can include a plural expression as longas it does not have an apparently different meaning in context.

In the present application, the terms “include” and “have” should beunderstood to be intended to designate that illustrated features,numbers, steps, operations, components, parts or combinations thereofexist and not to preclude the existence of one or more differentfeatures, numbers, steps, operations, components, parts or combinationsthereof, or the possibility of the addition thereof.

Unless otherwise specified, all of the terms which are used herein,including the technical or scientific terms, have the same meanings asthose that are generally understood by a person having ordinaryknowledge in the art to which the invention pertains. The terms definedin a generally used dictionary must be understood to have meaningsidentical to those used in the context of a related art, and are not tobe construed to have ideal or excessively formal meanings unless theyare obviously specified in the present application.

The following exemplary embodiments of the invention are provided tothose skilled in the art in order to describe the invention morecompletely. Accordingly, shapes and sizes of elements shown in thedrawings may be exaggerated for clarity.

As the information-oriented society is developed, needs for the displaydevice are increased in various forms. In line with the needs, recently,various display devices, such as a liquid crystal display device (LCD),a plasma display panel (PDP), an electro-luminescent display (ELD), anda vacuum fluorescent display (VFD), are researched and used.

From among them, a display device using organic light-emitting diodes(OLED) has advantages that it has an excellent brightnesscharacteristics and viewing angle characteristics compared to the LCDand it can be implemented in an ultra-thin type because it does not needa backlight unit.

Furthermore, a flexible display may be bent or wound on a roller. Adisplay device spread on the roller or wound on the roller, ifnecessary, may be implemented using the flexible display. In this case,there is a problem in stably winding or retracting the flexible displayon the roller or in stably unwinding or extending the flexible displayfrom the roller.

An organic light emitting diode (OLED) display is hereinafter describedas an example of a display panel, but the display panel that may beapplied to the present disclosure is not limited to a liquid crystalpanel and may include a liquid crystal display display (LCD), a plasmadisplay panel (PDP), and a field emission display (FED).

As shown in FIG. 1, hereinafter, a display device 100 may include afirst long side LS1, a second long side LS2 opposite the first long sideLS1, a first short side SS1 neighboring the first long side LS1 and thesecond long side LS2, and a second short side SS2 opposite the firstshort side SS1.

The first short side area SS1 may be called a first side area. Thesecond short side area SS2 may be called a second side area opposite thefirst side area. The first long side area LS1 may be called a third sidearea that neighbors the first side area and the second side area andthat is located between the first side area and the second side area.The second long side area LS2 may be called a fourth side area thatneighbors the first side area and the second side area, that is locatedbetween the first side area and the second side area, and that isopposite the third side area.

Furthermore, for convenience of description, the length of the first andthe second long sides LS1 and LS2 has been illustrated as being longerthan that of the first and the second short sides SS1 and SS2, but thelength of the first and the second long sides LS1 and LS2 may beapproximately the same as that of the first and the second short sidesSS1 and SS2.

Furthermore, hereinafter, a first direction DR1 may be a directionparallel to the long sides LS1 and LS2 of the display device 100, and asecond direction DR2 may be a direction parallel to the short sides SS1and SS2 of the display device 100.

A third direction DR3 may be a direction perpendicular to the firstdirection DR1 and/or the second direction DR2.

The first direction DR1 and the second direction DR2 may be collectivelyreferred to as a horizontal direction. Furthermore, the third directionDR3 may be called a vertical direction.

From another aspect, a side of the display device 100 on which an imageis displayed may be called a front or a front surface. When an image isdisplayed on the display device 100, a side on which an image cannot beviewed may be called a back or a back surface. When the display device100 is viewed from the front or the front surface, the first long sideLS1 may be called an upper side or a top surface. In the same manner,the second long side LS2 may be called a lower side or a bottom surface.In the same manner, the first short side SS1 may be called a left sideor a left surface, and the second short side SS2 may be called a rightside or a right surface.

Furthermore, the first long side LS1, the second long side LS2, thefirst short side SS1, and the second short side SS2 may be referred toas edges of the display device 100. Furthermore, points at which thefirst long side LS1, the second long side LS2, the first short side SS1,and the second short side SS2 are met may be referred to as corners. Forexample, the point at which the first long side LS1 and the first shortside SS1 are met may be a first corner C1. The point at which the firstlong side LS1 and the second short side SS2 are met may be a secondcorner C2. The point at which the second short side SS2 and the secondlong side LS2 are met may be a third corner C3. The point at which thesecond long side LS2 and the first short side SS1 are met may be afourth corner C4.

In this case, a direction from the first short side SS1 to the secondshort side SS2 or a direction from the second short side SS2 to thefirst short side SS1 may be called a left-right direction LR. Adirection from the first long side LS1 to the second long side LS2 or adirection from the second long side LS2 to the first long side LS1 maybe called an up-down direction UD.

An +x-axis direction may be referred to as a right direction or aright-side direction or a right surface direction. A −x-axis directionmay be referred to as a left direction or a left-side direction or aleft surface direction. A +y-axis direction may be referred to as anupper direction. A −y-axis direction may be referred to as a lowerdirection. A +z-axis direction may be referred to as a front directionor a front-side direction or a front surface direction. A −z-axisdirection may be referred to as a back direction or a backside directionor a back surface direction.

The x-axis direction may be parallel to the first direction. The y-axisdirection may be parallel to the second direction. The z-axis directionmay be parallel to the third direction.

Referring to FIG. 2, a display device 100 according to an embodiment ofthe present disclosure may include a display portion 20 and a housing30.

The display portion 20 may include a display panel 10 and a module cover15. The display panel 10 is provided in the front surface of the displaydevice 100, and an image may be displayed on the display panel 10. Thedisplay panel 10 may divide an image into a plurality of pixels, and maydisplay the image by controlling the pixels so that the pixels emitlight in accordance with color, brightness, and chroma for each pixel.The display panel 10 may be divided into an active area on which animage is displayed and an inactive area on which an image is notdisplayed.

If the display panel 10 has flexibility, it may be referred to as aflexible display panel 10.

The display panel 10 may have a rectangle, but is not limited thereto.The display panel 10 may have a shape having specific curvature at acorner. The display panel 10 may be an OLED panel, but is not limitedthereto. For example, the display panel 10 may be an LCD panel.

The module cover 15 may be provided in the back surface of the displaypanel 10. The module cover 15 may be directly attached to the displaypanel 10. The module cover 15 may have a size equal to or greater thanthe size of the display panel 10.

The module cover 15 may support the back surface of the display panel10. Accordingly, the module cover 15 may include a material which islight and has high strength. For example, the module cover 15 mayinclude an aluminum or stainless material.

The housing 30 may be provided in the back surface of the displayportion 20. That is, this means that the housing 30 may be provided inthe back surface of the module cover 15. The housing 30 may shield atleast one PCB. That is, this means that the housing 30 may cover atleast one PCB attached to the back surface of the module cover 15. Adetailed coupling structure and method of at least one PCB is describedlater.

Electromagnetic waves emitted by at least one PCB may be transferred tothe housing 30. Accordingly, although not shown, the housing 30 mayinclude an inner housing that is made of a conductive material and anouter housing that covers the inner housing. However, the presentdisclosure is not limited thereto. For example, the housing 30 may bemade of a single conductive material.

Referring to FIG. 3, in the display device 100 according to anembodiment of the present disclosure, the housing 30 may be locatedunder the display portion 20. More specifically, the housing 30 may havea shape that surrounds the lower portion of the display portion 20. Thehousing 30 may have several driving devices or driving circuits disposedtherein not exposed to the outside.

A width of the housing 30 in the first and the third directions may begreater than that of the display portion 20 in order to protect thedisplay portion 20 within the housing 30. A width of the housing 30 inthe second direction may be smaller than that of the display portion 20.

In the display device 100 according to an embodiment of the presentdisclosure, the housing 30 may not be located in the active area of thedisplay portion 20.

Referring to FIG. 4, the display device 100 according to an embodimentof the present disclosure may have a first state in which the activearea of the display portion 20 is located within the housing 30 and asecond state in which the active area of the display portion 20 isexposed outside the housing 30.

When the display device 100 is the first state, the active area of thedisplay portion 20 may be located within the housing 30. That is, thismeans that the display portion 20 may be shielded by the housing 30.

When the display device 100 is the second state, the active area of thedisplay portion 20 may be exposed outside the housing 30. That is, thismeans that when the display portion 20 is the second state, at leastsome of the display portion 20 may be protruded upward from the housing30.

Although not shown, the display portion 20 may change from the firststate to the second state by a roller located within the housing 30.More specifically, the display portion 20 may change from the firststate in which it has been wound by the roller to the second state inwhich the display portion 20 has been unwound and exposed to the outsideby the roller. To the contrary, when the roller is unwound and wound,the display portion 20 may change from the second state to the firststate. A detailed structure and operating method of the roller and thedisplay portion 20 are described later.

In the display device 100 according to an embodiment of the presentdisclosure, the display portion 20 may have any one of the first stateand the second state. Accordingly, the display portion 20 may be exposedoutside the housing 30 only when the display device 100 is used, andthus an occupied space may be reduced when not in use.

Referring to FIG. 5, in the display device according to an embodiment ofthe present disclosure, a panel roller 143 may be connected to one endof the display panel 10. The panel roller 143 may wind or unwind thedisplay panel 10 so that the display panel 10 has any one of the firststate and the second state. The panel roller 143 may also be referred toas the roller 143.

In the display device according to an embodiment of the presentdisclosure, at least one source PCB 120 may be located in at least partof the front surface of the display panel 10. The one or more sourcePCBs 120 may be spaced apart from each other.

Signal lines for transmitting digital video data and timing controlsignals transmitted by a timing controller board 105 may be located inthe at least one source PCB 120. The source PCB 120 may be connected tothe display panel 10 by a source chip on film (COF) 123. The source COF123 connected to one side of the source PCB 120 may be extended to theactive area of the display panel 10 and connected to the display panel10.

A seating portion 379 may be located in the outer circumference of thepanel roller 143. The seating portion 379 may form an accommodationspace B by stepping part of the outer circumference of the panel roller143. As the panel roller 143 is wound, the source PCB 120 may be locatedin a portion of the seating portion 379 where the source PCB 120 comesinto contact with the panel roller 143. The seating portion 379 may havea shape in which at least part of the outer circumference of the panelroller 143 has been depressed.

When the panel roller 143 is wound, the source PCB 120 may beaccommodated in the accommodation space B of the seating portion 379.Accordingly, although the panel roller 143 is wound, there may be nodamage to the source PCB 120.

The timing controller board 105 may be disposed within the panel roller143. An FFC cable 117 (e.g., a flexible flat cable) electricallyconnects the timing controller board 105 and the source PCB 120.

The panel roller 143 may include an upper panel roller 331 and a lowerpanel roller 337. The upper panel roller 331 and the lower panel roller337 may be coupled together by a screw. The timing controller board 105may be disposed between the upper panel roller 331 and the lower panelroller 337. The screw may combine the upper panel roller 331, the lowerpanel roller 337, and the timing controller board 105. The FFC cable 117may be connected to the timing controller board 105 and the source PCB120 through a hole 331 a located in the upper panel roller 331.

In the display device according to an embodiment of the presentdisclosure, the FFC cable 117 may not be entangled because the timingcontroller board 105 is rotated along with the panel roller 143.Furthermore, the space can be reduced because the timing controllerboard 105 is disposed within the panel roller 143.

Referring to FIG. 6, in the display device according to an embodiment ofthe present disclosure, the timing controller board 105 may be disposedin the panel roller 143 on one side of the central part of the housing30 on which the display panel rises and fall, and a main board 109 and apower supply 107 may be located on the other side of the central part ofthe housing 30.

The timing controller board 105 may be connected to the main board 109and the power supply 107. The timing controller board 105 may beconnected to the main board 109 and the power supply 107 through awiring electrode. The wiring electrode may include a first wiringelectrode 307 that connects the timing controller board 105 and thepower supply 107 and a second wiring electrode 309 that connects thetiming controller board 105 and the main board 109.

For example, a plurality of the first wiring electrodes 307 may be used.Furthermore, the first wiring electrode 307 may have a circle. The firstwiring electrode 307 may connect the timing controller board 105 and thepower supply 107 through the opening portion of the central part of thepivot of the panel roller 143.

The FFC cable 117 by which the timing controller board 105 and thesource PCB 120 are connected may be used as the second wiring electrode309. The second wiring electrode 309 may connect the timing controllerboard 105 and the main board 109 through the opening portion of thecentral part of the pivot of the panel roller 143.

The first wiring electrode 307 and the second wiring electrode 309 maybe located on the opposite sides of the timing controller board 105. Theopening portion through which the first wiring electrode 307 passes andthe opening portion through which the second wiring electrode 309 passesmay be located on opposite sides.

In the display device according to an embodiment of the presentdisclosure, the timing controller board 105 is disposed in the panelroller 143, and the power supply 107 and the main board 109 may belocated on the opposite sides of the display panel. Accordingly, thereis an advantage that the space within the housing 30 can be reduced.

Referring to FIG. 7, the display device according to an embodiment ofthe present disclosure may include the panel roller 143, a motorassembly 137, and a link 73 within the housing 30.

The link 73 may also be referred to as a support portion 73.

The module cover 15 may include a plurality of segments 15 a. Thesegment 15 a may also be referred to as an apron.

The panel roller 143 may be located at the front based on a portion onwhich the display portion 20 of the housing 30 rises or falls. The panelroller 143 may wind the display panel 10 and the module cover 15 at thesame time.

The link 73 may be installed on the housing 30. The link 73 may functionto support the display panel 10 and the module cover 15 so that theyrise or fall. The link 73 may raise or drop an upper bar 75 connected tothe upper part of the module cover 15 and the display panel 10.

The display portion 20 may have a top connected to the upper bar 75 anda bottom connected to the panel roller 143. A portion between the topand bottom of the display portion 20 may be easily bent. The link 73 maysupport the module cover 15 in the back surface of the module cover 15so that the module cover 15 is not bent.

The motor assembly 137 may be located in a portion to which the link 73is connected. The motor assembly 137 may drive the link 73 so that thelink rises or falls. The motor assembly 137 may receive an electricalsignal and convert it into a physical force. The motor assembly 137 maychange the link 73 from the first state to the second state bytransferring rotating energy to the link 73. A detailed structure anddriving principle of the motor assembly 137 are described later.

A guide bar 234 may be located at an entrance 30 a through which thelink 73 rises or falls into the housing 30. The guide bar 234 mayinclude first and second guide bars 234 a and 234 b. The entrance 30 aof the housing 30 may be formed between the first and the second guidebars 234 a and 234 b. The first and the second guide bars 234 a and 234b may face each other with the link 73 interposed therebetween. Forexample, the first guide bar 234 a may be located at the back of thelink 73, and the second guide bar 234 b may be located at the front ofthe link 73.

The display device according to an embodiment of the present disclosuremay wind the display panel 10 and the module cover 15 at the same timeusing a single roller. Accordingly, the thickness of the housing 30 canbe reduced.

Referring to FIG. 8, the segment 15 a may have a rectangle. The segments15 a may be separated in the y-axis direction, and may be attached tothe back surface of the display panel 10. The module cover 15 includesthe plurality of segments 15 a and may be wound or unwound by theroller. The module cover 15 may include a plastic or aluminum material.Accordingly, the module cover 15 can protect the display panel 10against an external impact.

The display panel 10 and the module cover 15 may be combined throughadhesive layers 70. The adhesive layer 70 may be a double-sided tape.The module cover 15, together with the display panel 10, may be wound onby the adhesive layers 70. The adhesive layers 70 may be located on thesegments 15 a and attached to the display panel 10. The adhesive layers70 may have been spaced apart from each other. Accordingly, the shape ofthe module cover 15 may be easily changed when the module cover 15 iswound or unwound by the roller. If the width of the adhesive layer 70 inthe second direction becomes thin, the display panel 10 is not wrinkledand may be naturally unwound from or wound on the panel roller 143.

Furthermore, as the width of the segment 15 a in the second directionincreases, the segment 15 a can stably support the display panel 10 dueto enhanced stiffness.

If the width of the adhesive layer 70 in the second direction is 30% orless of the width of the segment 15 a in the second direction, thewrinkling of the display panel 10 can be reduced because an externalforce is less applied to the display panel 10.

Furthermore, if the width of the adhesive layer 70 in the seconddirection is 15% or more of the width of the segment 15 a in the seconddirection, the wrinkling of the display panel 10 can be significantlyreduced because the stiffness of the display panel 10 is improved.

Furthermore, as the width of the adhesive layer 70 in the thirddirection increases, the display panel 10 may be less deformed withrespect to an external force. More specifically, as the width of theadhesive layer 70 in the third direction increases, the display panel 10and the module cover 15 can be stably attached due to enhancedflexibility.

Furthermore, as the width of the segment 15 a in the third directiondecreases, the wrinkling of the display panel 10 can be reduced. Morespecifically, as the width of the segment 15 a in the third directiondecreases, the wrinkling of the display panel 10 can be reduced due toenhanced stiffness.

Accordingly, if the width of the adhesive layer 70 in the thirddirection is 3% or more of the width of the segment 15 a in the thirddirection, the wrinkling of the display panel 10 can be significantlyreduced because the stiffness of the display panel 10 is enhanced.

Furthermore, if the width of the adhesive layer 70 in the thirddirection is 6% or less of the width of the segment 15 a in the thirddirection, the wrinkling of the display panel 10 can be significantlyreduced because the stiffness of the display panel 10 is increased.

In the display device according to an embodiment of the presentdisclosure, the module cover 15 includes the plurality of the segments15 a, and the adhesive layers 70 may be located on the segments 15 a,respectively.

Referring to FIGS. 9 and 10, in the display device according to anembodiment of the present disclosure, the module cover 15 and thedisplay panel 10 may be coupled to the upper bar 75. The module cover15, the display panel 10, and the upper bar 75 may be coupled togetherby screws 115 a and 115 b.

The screws 115 a and 115 b may enable the upper bar 75, the module cover15, and the display panel 10 to rise or fall together. The screw 115 amay couple the upper bar 75 and the module cover 15 together.Alternatively, the screw 115 b may couple the upper bar 75 and thedisplay panel 10 together, but the present disclosure is not limitedthereto. For example, the one or more screws 115 a and 115 b may couplethe module cover 15, the upper bar 75, and the display panel 10together.

The upper part of the module cover 15 may have a shape to be coupled tothe upper bar 75. An upper segment 15 t may be located at the top of themodule cover 15. The upper segment 15 t may have a shape different fromthose of the remaining segments 15 a. The upper segment 15 t may also bereferred to as an upper module cover 15 t.

The upper segment 15 t may include a first body 15 ta connected toanother segment 15 a and a second body 15 tb connected to the upper bar75. The bottom of the first body 15 ta may be connected to anothersegment 15 a, and the second body 15 tb may be formed at the upper partof the first body 15 ta.

The upper bar 75 may include a groove 75 a formed in the +y-axisdirection. The second body 15 tb may be inserted into the groove 75 a.The screw 115 a may penetrate the second body 15 tb in the z-axisdirection.

The thickness of the first body 15 ta in the z-axis direction may beformed to be thicker than that of the second body 15 tb in the z-axisdirection.

Referring to FIG. 10, a top casing 167 may shield the upper bar 75, themodule cover 15, and the display panel 10. The upper bar 75, the modulecover 15, and the display panel 10 may not be exposed outside the topcasing 167. Accordingly, an external appearance of the display devicemay become neat and trim.

The top casing 167 may be coupled to the upper bar 75, the module cover15 or the display panel 10 by a screw.

Referring to FIGS. 11 and 12, both ends of the module cover 15 may bebent in the +z-axis direction. The display panel 10 may be attached to aportion that belongs to the module cover 15 and that has not been bent.The length of both ends of the module cover 15 that have been bent inthe +z-axis direction may be greater than the sum of the thicknesses ofthe display panel 10 and the adhesive layer 70. That is, the bent lengthof the module cover 15 may be more protruded than the display panel 10in the +z-axis direction at a specific distance AD1. Accordingly, whenthe module cover 15 is viewed in the x-axis direction, the display panel10 may be covered.

Referring to FIG. 11, the adhesive layer 70 may be disposed between thedisplay panel 10 and the module cover 15. The adhesive layer 70 may belengthily disposed in the x-axis direction. The entire display panel 10may be attached to the module cover 15. In this case, the module cover15 and the display panel 10 may not be separated because an adhesiveforce between them is very strong.

Referring to FIG. 12, the adhesive layer 70 may be disposed between thedisplay panel 10 and the module cover 15. The adhesive layer 70 may bedisposed in a portion between the display panel 10 and the module cover15. For example, the adhesive layers 70 may be disposed at one end andthe other end of the display panel 10, respectively. Accordingly, theadhesive layer 70 may be less used compared to a case where the adhesivelayer 70 is disposed lengthwise in the x-axis direction. Accordingly, aproduction cost for the display device can be reduced.

The display panel 10 and the module cover 15 have been illustrated asbeing attached through the adhesive layer 70, but the present disclosureis not limited thereto. For example, the display panel 10 and the modulecover 15 may be attached through a magnet.

Referring to FIG. 13, a bead 136 may be formed on a top surface of asegment 15 b. The bead 136 may have a shape depressed into the segment15 b. The bead 136 may have a shape depressed in the −y-axis direction.A plurality of the beads 136 may be formed on the segment 15 b. Theplurality of beads 136 may be spaced apart from each other. The bead 136can enhance a stiffness of the segment 15 b. For example, the bead 136can prevent the shape of the segment 15 b from being deformed by anexternal impact.

Referring to FIG. 14, the source PCB 120 may be located over the modulecover 15. The location of the source PCB 120 may be changed along with amovement of the module cover 15 when the display device changes from thefirst state to the second state.

An FFC cable 231 may be located at the central part of the module cover15 based on the first direction, but the present disclosure is notlimited thereto. For example, the FFC cables 231 may be located on bothends of the module cover 15 based on the first direction.

Referring to FIG. 15, a segment 15 d may include a depressed portion 425depressed in the −z-axis direction. The depressed portion 425 may form aspace between the display panel 10 and the module cover 15. The FFCcable 231 may be accommodated in the space formed by the depressedportion 425. Furthermore, the depressed portion 425 can enhance thestiffness of the segment 15 d.

The bead 136 may be located on the segment 15 d other than the portionwhere the depressed portion 425 is located. The bead 136 may not belocated in the portion where the depressed portion 425 is locatedbecause the thickness of the segment 15 d in the third direction is thinin the portion where the depressed portion 425 is located. However, thepresent disclosure is not limited thereto. For example, the bead 136 maybe located in any portion where the depressed portion 425 is located.

Referring to FIG. 16, a penetration portion 437 may be located at acentral part of a segment 15 e based on the first direction. Thepenetration portion 437 may pass through the central part of the segment15 e in the second direction. That is, the penetration portion 437 maybe a hole located within the segment 15 e. The penetration portion 437may be a portion where the FFC cable 231 is located. The thickness ofthe segment 15 e can be reduced compared to a case where the FFC cable231 is located in the depressed portion 425 because the penetrationportion 437 is formed within the segment 15 e.

The bead 136 may be located on the segment 15 e other than the portionwhere the penetration portion 437 is located. The bead 136 may not belocated in the portion where the penetration portion 437 is locatedbecause the thickness of the segment 15 e in the third direction is thinin the portion where the penetration portion 437 is located, but thepresent disclosure is not limited thereto. For example, the bead 136 maybe located in the portion where the penetration portion 437 is located.

Referring to FIG. 17, in the display device according to an embodimentof the present disclosure, the top casing 167 can shield the source PCB120 and the upper bar 75 in addition to the display panel 10 and themodule cover 15. Accordingly, an external appearance of the displaydevice may become neat and tidy because the source PCB 120 is notexposed to the outside.

The upper bar 75 may have one side coupled to the back surface of themodule cover 15 and the other side coupled to the source PCB 120. Theupper bar 75 may be fixed to the module cover 15 and may support thesource PCB 120.

The bottom end of the FFC cable 231 may be connected to the timingcontroller board 105 within the panel roller 143. The FFC cable 231,together with the display portion 20, may be wound on or unwound fromthe panel roller 143.

Part of the FFC cable 231 may be located between the display panel 10and the module cover 15. A portion that belongs to the FFC cable 231 andthat is located between the display panel 10 and the module cover 15 maybe referred to as a first portion 231 a. The first portion 231 a may belocated in the depressed portion 425 formed by the plurality of segments15 d. Alternatively, the first portion 231 a may be accommodated in thedepressed portion 425 formed by the plurality of segments 15 d.

Part of the FFC cable 231 may pass through a segment 15 f. A portionthat belongs to the FFC cable 231 and that passes through the segment 15f may be referred to as a second portion 231 b. The segment 15 f mayinclude a first hole 521 a formed in the front surface and a second hole521 b formed in the back surface. The first hole 521 a and the secondhole 521 b may be connected to form a single hole 521. The hole 521 maypass through the segment 15 f in the third direction. The second portion231 b may pass through the hole 521. The hole 521 may also be referredto as a connecting hole 521.

The top end of the FFC cable 231 may be electrically connected to thesource PCB 120. Part of the FFC cable 231 may be located in the backsurface of the module cover 15. A portion that belongs to the FFC cable231 and that is located in the back surface of the module cover 15 maybe referred to as a third portion 231 c. The third portion 231 c may beelectrically connected to the source PCB 120.

The third portion 231 c may be shielded by the top casing 167.Accordingly, the third portion 231 c may not be exposed to the outside.

Referring to FIG. 18, in the display device according to an embodimentof the present disclosure, the FFC cable 231 may be connected to thetiming controller board 105 mounted on the panel roller 143. A throughhole 615 may be located on the panel roller 143. The FFC cable 231 maybe connected to the timing controller board 105 through the through hole615.

The through hole 615 is located on one side of the panel roller 143, andmay pass through the outer portion of the panel roller 143. The FFCcable 231 may be connected to one side of the timing controller board105 through the through hole 615.

In the display device according to an embodiment of the presentdisclosure, although the FFC cable 231 is located on the outercircumference of the panel roller 143, it can maintain connection withthe timing controller board 105 through the through hole 615.Accordingly, the FFC cable 231 may not be twisted because it rotatesalong with the panel roller 143.

Part of the FFC cable 231 may be wound on the panel roller 143. Aportion that belongs to the FFC cable 231 and that is wound on the panelroller 143 may be referred to as a fourth portion 231 d. The fourthportion 231 d may come into contact with the outer surface of the panelroller 143.

Part of the FFC cable 231 may pass through the through hole 615. Aportion that belongs to the FFC cable 231 and that passes through thethrough hole 615 may be referred to as a fifth portion 231 e.

The bottom end of the FFC cable 231 may be electrically connected to thetiming controller board 105. Part of the FFC cable 231 may be locatedwithin the panel roller 143. A portion that belongs to the FFC cable 231and that is located within the panel roller 143 may be referred to as asixth portion 231 f The sixth portion 231 f may be electricallyconnected to the timing controller board 105.

Referring to FIG. 19, a back surface of a display panel 10 may beattached to a plate 11. A front surface of the display panel 10 maydisplay a screen. The plate 11 may include a metal material.

Referring to FIGS. 20A, 20B, 25 and 26, a plate 11 a may include aplurality of holes 12. The plate 11 a may include an area where theholes 12 are formed and areas 11 f, 11 g, and 11 h where the holes 12are not formed. The areas 11 f, 11 g, and 11 h where the holes 12 arenot formed may surround the areas where the holes 12 are formed. Theareas 11 f, 11 g, and 11 h where the holes 12 are not formed can protectedges of the display panel 10. The holes 12 may be referred to asopenings 12.

A first area 11 g where the holes 12 are not formed, the area where theholes 12 are formed, and a second area 11 h where the holes 12 are notformed may be sequentially located along the left-right direction LR ofthe plate 11 a. A width of the first area 11 g in the left-rightdirection LR may be a2. A width of the area where the holes 12 areformed in the left-right direction LR may be a1. A width of the secondarea 11 h in the left-right direction LR may be a3.

A third area 11 f where the holes 12 are not formed and the area wherethe holes 12 are formed may be sequentially located along the up-downdirection UD of the plate 11 a. A height of the third area 11 f in theup-down direction UD may be b2. A height of the area where the holes areformed in the up-down direction UD may be b1.

The third area 1 if where the holes 12 are not formed may be coupledwith a device. For example, the device may be an upper bar. The upperbar may be coupled with a link.

The holes 12 may penetrate the plate 11 a. The holes 12 may be formed bypunching the plate 11 a. The holes 12 may be slits 12 a and 12 b. Theslits 12 a and 12 b may be elongated along the left right-direction LRof the plate 11 a. The holes 12 may include a relatively long slit 12 aand a relatively short slit 12 b.

The relatively long slit 12 a may have a length d8 and a width d9. Therelatively short slit 12 b may have a length d10 and a width d9.

The slits 12 a and 12 b may be spaced along the left-right direction LRof the plate 11 a. The neighboring slits 12 a and 12 b may be locatedwith a constant distance d2.

The slits 12 a and 12 b may be spaced along the up-down direction UD ofthe plate 11 a. The neighboring slits 12 a and 12 b may be located witha constant distance d1.

The smaller the distances d1, d2 between the slits 12 a, 12 b are, themore easily the plate 11 a can be wound or unwound. The greater thedistances d1, d2 between the slits 12 a, 12 b are, the greaterelasticity the plate 11 a has.

The display panel 10 may have a very thin thickness. The display panel10 can be easily wrinkled due to its thin thickness. The display panel10 can be easily broken from an external impact due to its thinthickness.

The plate 11 may be fixed to the display panel 10 to increase rigidityof the display panel 10. The plate 11 supports the display panel 10 toprevent the display panel 10 from being wrinkled.

The plate 11 may be made of a metal material having high rigidity. Theplate 11 is preferably made of a material having high elasticity. Theplate 11 is provided with the slits 12 a and 12 b so that it can bewound or unwound by the roller 143. Since the plate 11 is provided withthe slits 12 a and 12 b, permanent deformation may not occur even if itis wound or unwound by the roller 143.

An adhesive layer 13 may be formed on the back surface of the displaypanel 10. The adhesive layer 13 can fix the display panel 10 to theplate 11. The display panel 10, the adhesive layer 13, and the plate 11may be integrally coupled to form a display portion, and may be wound orunwound by the roller 143.

The slits 12 a and 12 b may be arranged in rows and columns. Odd rowsr1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 may becomposed of the relatively long slits 12 a. The slits 12 a in the oddrows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 maybe arranged in columns t1, t2, t3, t4, t5, t6, t7, and t8.

Even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22, and r24 maybe composed of the relatively short slit 12 b and the relatively longslit 12 a. The slits 12 a and 12 b in the even rows may be arranged incolumns. The slits 12 a and 12 b in the even rows r2, r4, r6, r8, r10,r12, r14, r16, r18, r20, r22 and r24 may be arranged in columns s1, s2,s3, s4, s5, s6, s7, s8, and s9.

The relatively short slit 12 b and the relatively long slit 12 a may bearranged alternately along the up-down direction UD. The relativelyshort slits 12 b may be arranged on both sides of the left-rightdirection LR in the even rows r2, r4, r6, r8, r10, r12, r14, r16, r18,r20, r22, and r24.

A straight line 11 connecting a center c221 of a first slit 12 b 221 ofa 22nd row r22 and a center c222 of a second slit 12 a 222 of the 22ndrow r22 may pass through centers of remaining slits of the 22nd row r22.

A straight line 12 connecting a center c231 of a first slit 12 b 231 ofa 23rd row r23 and a center c232 of a second slit 12 a 232 of the 23rdrow r23 may pass through centers of remaining slits of the 23rd row r23.

A straight line 13 connecting a center c241 of a first slit 12 b 241 ofa 24th row r24 and a center c242 of a second slit 12 a 242 of the 24throw r24 may pass through centers of remaining slits of the 24th row r24.

A straight line 14 connecting a center c251 of a first slit 12 a 251 ofa 25th row r25 and a center c252 of a second slit 12 a 252 of the 25throw r25 may pass through centers of remaining slits of the 25th row r25.

A straight line 15 connecting a center c221 of a 11th slit 12 b 221 of afirst column s1 and a center line c241 of a 12th slit 12 b 241 of thefirst column s1 in the even rows r2, r4, r6, r8, r10, r12, r14, r16,r18, r20, r22, and r24 may pass through centers of remaining slits ofthe first column s1.

A straight line 16 connecting a center c231 of a 12th slit 12 a 231 of afirst column t1 and a center c251 of a 13th slit 12 a 251 of the firstcolumn t1 in the odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19,r21, r23, and r25 may pass centers of remaining slits of the firstcolumn t1.

A straight line 17 connecting a center c222 of an 11th slit 12 a 222 ofa second column s2 and a center line c242 of a 12th slit 12 a 242 of thesecond column s2 in the even rows r2, r4, r6, r8, r10, r12, r14, r16,r18, r20, r22, and r24 may pass through centers of remaining slits ofthe second column s2.

A straight line 18 connecting a center c232 of a 12th slit 12 a 232 of asecond column t2 and a center c252 of a 13th slit 12 a 252 of the secondcolumn t2 in the odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19,r21, r23, and r25 may pass centers of remaining slits of the secondcolumn t2.

A center distance d11 of neighboring slits 12 a 232 and 12 a 233 in thesame row may be larger than a length d8 of a slit 12 a 243 of theneighboring row.

A center distance d13 between slits 12 a 237, 12 a 247 and 12 a 248 ofneighboring rows r23 and r24 and a center distance d11 between slits 12a 247 and 12 a 248 in the same row r24 may be an isosceles triangle. Thecenter distance d11 between the slits 12 a 247 and 12 a 248 in the samerow r24 may be a base of the isosceles triangle. A distance d12 betweenthe neighboring rows r23 and r24 may be a height of the isoscelestriangle.

Referring to FIGS. 21, 25 and 26, a plate 11 b may include a pluralityof holes 12. The plate 11 b may include an area where the holes 12 areformed and an area 11 j where the holes 12 are not formed. The area 11 jwhere the holes 12 are not formed may be located on an upper side of thearea where the holes 12 are formed. The area 11 j where the holes 12 arenot formed can protect edges of the display panel 10.

The area 11 j where the holes 12 are not formed may be coupled with adevice. For example, the device may be an upper bar. The upper bar maybe coupled with a link.

A height of the third area 11 j where the holes 12 are not formed may beb4 in the up-down direction UD. A height of the area where the holes 12are formed may be b3 in the up-down direction UD.

The holes 12 may penetrate the plate 11 b. The holes 12 may be formed bypunching the plate 11 b. The holes 12 may be slits 12 a, 12 c, and 12 d.The slits 12 a, 12 c, and 12 d may be elongated along the leftright-direction LR of the plate 11 b. The holes 12 may include arelatively long slit 12 a and 12 c and a relatively short slit 12 d. Theholes 12 may include the slits 12 c and 12 d which are opened at oneside.

The slits 12 a and 12 c may be spaced along the left-right direction LRof the plate 11 b. Neighboring slits 12 a 168, 12 a 169, 12 a 187, and12 a 188 may be located with a constant distance d2.

The slits 12 c and 12 d may be spaced along the up-down direction UD ofthe plate 11 b. The neighboring slits 12 c and 12 d may be located witha constant distance d1.

The slits 12 a, 12 c, and 12 d may be arranged in rows and columns. Oddrows e1, e3, e5, e7, e9, e11, e13, e15, e17, e19, e21, e23 and e25 maybe composed of the relatively long slits 12 a and 12 c. The slits 12 aand 12 c in the odd rows e1, e3, e5, e7, e9, e11, e13, e15, e17, e19,e21, e23, and e25 may be arranged in columns g1, g2, g3, g4, g5, g6, g7,and g8.

Even rows e2, e4, e6, e8, e10, e12, e14, e16, e18, e20, e22, and e24 maybe composed of the relatively short slit 12 d and the relatively longslit 12 a. The slits 12 a and 12 d in the even rows may be arranged incolumns. The slits 12 a and 12 d in the even rows e2, e4, e6, e8, e10,e12, e14, e16, e18, e20, e22, and e24 may be arranged in columns f1, f2,f3, f4, f5, f6, f7, f8, and f9.

The relatively short slit 12 d and the relatively long slit 12 c may bealternately arranged along the up-down direction UD. The relativelyshort slits 12 d may be arranged on both sides of the left-rightdirections LR in the even rows e2, e4, e6, e8, e10, e12, e14, e16, e18,e20, e22, and e24.

The relatively long slits 12 c, 12 c 158, and 12 c 178 among the slits12 c and 12 d having one side opened may have a length d14 and a widthd9. The relatively short slits 12 d, 12 d 169, and 12 d 189 among theslits 12 c and 12 d having one side opened may have a length d15 and awidth d9.

The length d14 of the slits 12 c, 12 c 158, and 12 c 178 having one sideopened and the length d8 of the slits 12 a, 12 a 157, and 12 a 168without opening may be the same.

Referring to FIG. 22, a plate 11 c may include a plurality of holes 12f. The plate 11 c may include an area where the holes 12 f are formedand areas 11 k, 11 l, and 11 m where the holes 12 f are not formed. Theareas 11 k, 11 l, and 11 m where the holes 12 f are not formed maysurround the areas where the holes 12 f are formed. The areas 11 k, 11l, and 11 m where the holes 12 f are not formed can protect edges of thedisplay panel 10. The area 11 k where the holes 12 f are not formed maybe coupled with a device. For example, the device may be an upper bar.The upper bar may be coupled with a link.

The holes 12 f may penetrate the plate 11 c. The holes 12 f may beformed by punching the plate 11 c. The holes 12 f may have a shape of arhombus.

The holes 12 f may have a length d17 in the left-right direction LR anda length d16 in the up-down direction UD. Neighboring holes 12 f mayhave a distance d18 in the left-right direction LR. The neighboringholes 12 f may have a distance d19 in the up-down direction UD.

Referring to FIGS. 23, 25 and 26, a plate 11 d may include a pluralityof holes 12 g. The plate 11 d may include an area where the holes 12 gare formed and areas 11 o, 11 p, and 11 q where the holes 12 g are notformed. The areas 11 o, 11 p, and 11 q where the holes 12 g are notformed may surround the areas where the holes 12 g are formed. The areas11 o, 11 p, and 11 q where the holes 12 g are not formed can protectedges of the display panel 10.

The area 11 o where the holes 12 g are not formed may be coupled with adevice. For example, the device may be an upper bar. The upper bar maybe coupled with a link.

The holes 12 g may penetrate the plate 11 d. The holes 12 g may beformed by punching the plate 11 d. The holes 12 g may have a shape of acircle.

The holes 12 g may be spaced along the left-right direction LR of theplate 11 d. The holes 12 g may be spaced along the up-down direction UDof the plate 11 d.

The holes 12 g may be arranged in rows p1, p2, p3, p4, p5, p6, p7, p8,p9, p10, p11, p12, p13, p14, p15, and p16 and columns q1, h1, q2, h2,q3, h3, q4, h4, q5, h5, q6, h6, q7, h7, q8, h8, and q9.

The holes 12 g and 12 g 121 may have a diameter d20.

Neighboring holes 12 g 122, 12 g 142, 12 g 132, and 12 g 152 in the samecolumns h2 and q3 may have a distance d22 in the up-down direction UD.Neighboring holes 12 g 131, 12 g 132, 12 g 141, and 12 g 142 in the samerows p13 and p14 may have a distance d21 in the left-right direction LR.

A center distance d23 between the holes 12 g 142, 12 g 151 and 12 g 152in neighboring rows q2, h2 and q3 and a center distance d24 between theholes 12 g 151 and 12 g 152 in the same row p15 may be an isoscelestriangle.

Referring to FIGS. 24, 25, and 26, a plate 11 e may include a pluralityof holes 12 h. The plate 11 e may include an area where the holes 12 hare formed and areas 11 r, 11 s, and 11 t where the holes 12 h are notformed. The areas 11 r, 11 s, and 11 t where the holes 12 h are notformed may surround the area where the holes 12 h are formed. The areas11 r, 11 s, and 11 t where the holes 12 h are not formed can protectedges of the display panel 10.

The area 11 r where the holes 12 h are not formed may be coupled with adevice. For example, the device may be an upper bar. The upper bar maybe coupled with a link.

The holes 12 h may penetrate the plate 11 e. The holes 12 h may beformed by punching the plate 11 e. The holes 12 h may have a shape of anellipse. The hole 12 h may be in the form of a long hole. The holes 12 hmay be elongated along the left-right direction LR of the plate 11 e.

The holes 12 h may be spaced along the left-right direction LR of theplate 11 e. Neighboring holes 12 h may be located with a constantdistance d7.

The holes 12 h may be spaced along the up-down direction UD of the plate11 e. Neighboring holes 12 g may be located with a constant distance d6.

The holes 12 g may be arranged in rows u1, u2, u3, u4, u5, u6, u7, u8,u9, u10, u11, u12, u13, u14, u15, u16, u17, u18, u19, u20, u21, u22,u23, u24, u25, u26, and u27 and columns v1, w1, v2, w2, v3, w3, v4, w4,v5, w5, v6, w6, v7, w7, v8, w8, and v9.

Neighboring holes 12 h 231, 12 h 251, 12 h 222, and 12 h 242 in the samerows v1 and w2 may have a distance d27 in the up-down direction UD.Neighboring holes 12 h 221, 12 h 222, 12 h 251, and 12 h 252 in the samerows u22 and u25 may have a distance d28 in the left-right direction LR.

A center distance d29 between the holes 12 h 232, 12 h 241, and 12 h 242in neighboring rows w1, v2 and w2 and a center distance d30 between theholes 12 h 241 and 12 h 242 in the same row u24 may be an isoscelestriangle.

Referring to FIG. 27, a plate 11 may be coupled to a back surface of adisplay panel 10. A first resin layer 14 may be coupled to a backsurface of the plate 11.

The first resin layer 14 may cover the plate 11. The plate 11 may not beexposed to outside due to the first resin layer 14.

Referring to FIGS. 28 and 29, the first resin layer 14 and the plate 11may be coupled through a laminating process. The plate 11 may be placedon the first resin layer 14.

The plate 11 and the first resin layer 14 may be heated through aheating device. A portion of the first resin layer 14 may be melted. Themelted first resin layer 14 may be adhered to the plate 11. The meltedfirst resin layer 14 can fill the holes 12 of the plate 11. The plate 11may be accommodated in the first resin layer 14.

When the heated plate 11 and the first resin layer 14 are cooled, theplate 11 and the first resin layer 14 may be integrally formed. A frontsurface of the combination of the plate 11 and the first resin layer 14may be flat.

Referring to FIGS. 30 and 31, an adhesive layer 13 may be formed on aback surface of the display panel 10. The adhesive layer 13 can fix thedisplay panel 10 to the plate 11. The adhesive layer 13 can fix thedisplay panel 10 to the first resin layer 14 because the front surfaceof the combination of the plate 11 and the first resin layer 14 is flat.

The first resin layer 14 may be a material having high softness. Forexample, the first resin layer 14 may include a material of urethane orrubber.

The display panel 10, the adhesive layer 13, the plate 11, and the firstresin layer 14 may be integrally coupled to form a display portion andmay be wound or unwound on the roller 143.

Referring to FIG. 32, a second resin layer 16 may be coupled to a backsurface of a display panel 10. A plate 11 may be coupled to a backsurface of the second resin layer 16. A first resin layer 14 may becoupled to a back surface of the plate 11.

The first resin layer 14 may cover the plate 11. The plate 11 may not beexposed to outside due to the first resin layer 14.

Referring to FIGS. 33 and 34, the plate 11 may be disposed between thefirst resin layer 14 and the second resin layer 16. The first resinlayer 14, the second resin layer 16, and the plate 11 may be coupledthrough a laminating process. The first resin layer 14 and the secondresin layer 16 may be coupled with each other to form a first resinlayer. A material of the first resin layer 14 and a material of thesecond resin layer 16 may be the same. The first resin layer 14 maypartially melt and fill the holes 12 of the plate 11. The second resinlayer 16 may partially melt and fill the holes 12 of the plate 11. Thefirst resin layer may partially melt and fill the holes 12 of the plate11. The plate 11 may be disposed inside the first resin layer.

The plate 11, the first resin layer 14, and the second resin layer 16may be integrally formed. The plate 11 and the first resin layer may beformed integrally. A front surface of the second resin layer 16 may beflat. A front surface of the first resin layer may be flat.

An adhesive layer 13 may be formed on a back surface of the displaypanel 10. The adhesive layer 13 can fix the display panel 10 to thesecond resin layer 16. The adhesive layer 13 can fix the display panel10 to the first resin layer.

The second resin layer 16 may be a material having high softness. Forexample, the second resin layer 16 may include a material of urethane orrubber.

The first resin layer may be a material having high softness. Forexample, the first resin layer may include a material of urethane orrubber.

The display panel 10, the adhesive layer 13, the second resin layer 16,the plate 11, and the first resin layer 14 may be integrally coupled toform a display portion and may be wound or unwound on the roller 143.The display panel 10, the adhesive layer 13, the first resin layer, andthe plate 11 may be integrally coupled to form a display portion and maybe wound or unwound by the roller 143.

The larger a distance d31 of the holes 12 is, the larger a coupled areaof the first resin layer 14 and the second resin layer 16 can be. Thelarger the coupled area of the first resin layer 14 and the second resinlayer 16 becomes, the more strongly the first resin layer 14 and thesecond resin layer 16 can be coupled.

Referring to FIG. 35, the display device according to an embodiment ofthe present disclosure may have a shape in which both sides of the upperbar 75 are supported by the links 73. The upper bar 75 may rise or fallby the links 73. Each of the links 73 may include a first arm 73 a and asecond arm 73 b.

The first arm 73 a may also be referred to as an upper link 73 a. Thesecond arm 73 b may also be referred to as a lower link 73 b.

The first arm 73 a and the second arm 73 b may be connected by an armjoint 152. The arm joint 152 may also be referred to as the hinge 152 orthe joint 152.

The top of the first arm 73 a may be coupled to the upper bar 75. Theother end of the first arm 73 a may be coupled to the arm joint 152. Thetop of the second arm 73 b may be coupled to the motor assembly. Thebottom of the second arm 73 b may be coupled to the arm joint 152.

A guide bar 234 may be located at the entrance 30 a through which thelink 73 rises or fall into the housing 30. The guide bar 234 may includefirst and second guide bars 234 a and 234 b. The entrance 30 a of thehousing 30 may be formed between the first and the second guide bars 234a and 234 b. The first and the second guide bars 234 a and 234 b mayface each with the link 73 interposed therebetween. For example, thefirst guide bar 234 a may be located at the back of the link 73, and thesecond guide bar 234 b may be located at the front of the link 73.

The panel roller 143 may be located at the front of the link 73. Thebase 31 of the housing 30 may include a plurality of brackets 221. Thebase 31 may also be referred to as a bottom surface 31.

The plurality of brackets 221 may be formed under the panel roller 143.The plurality of brackets 221 may be spaced apart from each other in thelength direction of the panel roller 143. Alternatively, the pluralityof brackets 221 may be spaced apart from each other in the lengthdirection of the base 31. Each of the brackets 221 may be fixed to thebase 31 through a screw.

Referring to FIG. 36, the display device according to an embodiment ofthe present disclosure may have a gear shape in which the other side ofthe first arm 73 a and one side of the second arm 73 b located withinthe arm joint 152 correspond to each other and are geared. The arm joint152 may also be referred to as a connecting portion 152. The first arm73 a may also be referred to as the upper support link 73 a. The secondarm 73 b may also be referred to as the lower support link 73 b.

The first arm 73 a may be pivotally connected to the upper part of thearm joint 152. The second arm 73 b may be pivotally connected to thelower part of the arm joint 152.

A gear st1 may be formed at the lower part of the first arm 73 a. A gearst2 may be formed at the lower part of the second arm 73 b. The gear st1of the first arm 73 a and the gear st2 of the second arm 73 b may geartogether.

The angle HRA1 of the first arm 73 a from the ground and the angle HRA2of the second arm 73 b from the ground may be the same because the firstarm 73 a and the second arm 73 b have the gear shape in which they areengaged. Furthermore, the angles between the first arms 73 a and thesecond arms 73 b on both sides may be the same because the first arm 73a and the second arm 73 b have the gear shape in which they are engaged.Accordingly, both sides of the upper bar 75 may rise or fall whilemaintaining horizontality without leaning to one side. That is, theangles between the first arms 73 a and second arms 73 b of the links 73on both sides may be the same regardless of the height of the upper bar75 from the ground.

Referring to FIGS. 37 to 39, as the display device according to anembodiment of the present disclosure changes from the first state to thesecond state, the upper bar 75 may rise. The upper bar 75 may rise up orfall down by the link 73 connected to both ends of the upper bar.

As shown in FIG. 37, in the first state, the angle HRA between the firstarm 73 a and the second arm 73 b may be very small. Accordingly, theupper bar 75 may not rise. Furthermore, the display panel and the modulecover may have been wound on the panel roller.

As shown in FIG. 38, when the motor assembly 137 rotates, the angle HRAbetween the first arm 73 a and the second arm 73 b may increase. As theangle HRA between the first arm 73 a and the second arm 73 b increases,the upper bar 75 may rise. Accordingly, the display panel and the modulecover wound on the panel roller may be gradually unwound.

As shown in FIG. 39, in the second state, the first arm 73 a and thesecond arm 73 b may be located on a straight line. That is, the angleHRA between the first arm 73 a and the second arm 73 b may become 180degrees. Accordingly, the upper bar 75 may rise to a maximum height.Furthermore, the display panel and the module cover may be unwound fromthe panel roller.

Referring to FIG. 40, the display device according to an embodiment ofthe present disclosure may include a plurality of the first arms 73 aand the second arms 73 b.

More specifically, the first arm 73 a may include a first upper arm 73Caand a second upper arm 73Fa. Furthermore, the second arm 73 b mayinclude a first lower arm 73Cb and a second lower arm 73Fb.

The first upper arm 73Ca may also be referred to as a first upper link73Ca. The second upper arm 73Fa may also be referred to as a secondupper link 73Fa. The first lower arm 73Cb may also be referred to as afirst lower link 73Cb. The second lower arm 73Fb may also be referred toas a second lower link 73Fb.

The first arm 73 a may be pivotally connected to the upper part of thearm joint 152. The second arm 73 b may be pivotally connected to thelower part of the arm joint 152.

More specifically, the second upper arm 73Fa may be connected over thefirst upper arm 73Ca. The second lower arm 73Fb may be connected underthe first lower arm 73Cb.

A gear st3 may be formed at the lower part of the first upper arm 73Ca.A gear st4 may be formed at the upper part of the first lower arm 73Cb.The gear st3 of the first upper arm 73Ca and the gear st4 of the firstlower arm 73Cb may gear together.

The angle HRA1 of the first upper arm 73Ca from the ground and the angleHRA2 of the first lower arm 73Cb from the ground may be the same becausethe first upper arm 73Ca and the first lower arm 73Cb gear together.Furthermore, the angles between the first upper arms 73Ca and the firstlower arms 73Cb on both sides may be the same because the first upperarm 73Ca and the first lower arm 73Cb on each of both sides geartogether. Accordingly, the upper bar 75 can rise or fall whilemaintaining horizontality without learning to one side. That is, theangles between the first upper arms 73Ca and the first lower arms 73Cbon both sides may be the same regardless of the height of the upper bar75 from the ground.

A gear may not be formed in the second upper and lower arms 73Fa and73Fb. The angle between the second upper arm 73Fa and the second lowerarm 73Fb is the same as that between the first upper arm 73Ca and thefirst lower arm 73Cb.

As shown in FIG. 41, in a display device according to one embodiment,upper and lower arms 73 a and 73 b may be formed of a single arm.Accordingly, when an external force F is applied to one side, the angleHLA between the upper and lower arms 73 a and 73 b may be changed. Inthis case, the display panel may incline toward one side.

In contrast, as shown in FIG. 42, when the gear st3 of the first upperarm 73Ca and the gear st4 of the first lower arm 73Cb gear together,although an external force F is applied to one side of the displaydevice, the angle HLA between the upper and lower arms 73 a and 73 b maynot be changed. Accordingly, damage attributable to the inclination ofthe display panel can be prevented.

Referring to FIG. 43, one side of the first upper and lower arms 73Caand 73Cb may extend in a direction toward the second upper and lowerarms 73Fa and 73Fb. That is, the width of the first upper and lower arms73Ca and 73Cb may increase. Accordingly, when the link 73 is viewed fromthe front of the display device, the first upper and lower arms 73Ca and73Cb may shield the second upper and lower arms 73Fa and 73Fb at thefront surface. Alternatively, the first upper arm 73Ca and the secondupper arm 73Fa may be superimposed. Alternatively, the first lower arm73Cb and the second lower arm 73Fb may be superimposed.

The pivot of the first upper arm 73Ca, the pivot of the second upper arm73Fa, the pivot of the first lower arm 73Cb, and the pivot of the secondlower arm 73Fb may be spaced apart from each other.

The height of the arm joint 152 in the vertical direction at a portionconnected to the first upper and lower arms 73Ca and 73Cb may bedifferent from the height of the arm joint 152 in the vertical directionat a portion connected to the second upper and lower arms 73Fa and 73Fb.

Although not shown, one side of the second upper and lower arms 73Fa and73Fb may extend in a direction toward the first upper and lower arms73Ca and 73Cb. That is, when viewed from the back surface, the width ofthe second upper and lower arms 73Fa and 73Fb may increase. Accordingly,the second upper and lower arms 73Fa and 73Fb may shield the first upperand lower arms 73Ca and 73Cb at the front surface.

As shown in FIG. 44, in the first state, the width of at least part ofthe first upper and lower arms 73Ca and 73Cb may overlap or superimposethe second upper and lower arms 73Fa and 73Fb. For example, the firstupper and lower arms 73Ca and 73Cb may be isolated from the second upperand lower arms 73Fa and 73Fb at a specific distance SLB, and may overlapthe second upper and lower arms 73Fa and 73Fb. Accordingly, the totalwidth HLW of the first arm 73 a may be greater than the width of thesecond upper arm 73Fa or the width CLW of the first upper arm 73Ca.

In some embodiments, as shown in FIG. 45, in the second state, a totalwidth of the first upper and lower arms 73Ca and 73Cb may superimposethe second upper and lower arms 73Fa and 73Fb. Accordingly, the totalwidth HLW of the first arm 73 a may be the same as the width of thesecond upper arm 73Fa or the width CLW of the first upper arm 73Ca.

As shown in FIG. 46, if one side of the first upper arm 73Ca has notextended, when the first upper arm 73Ca changes from the second state tothe first state, the first upper arm 73Ca and the second upper arm 73Famay be spaced apart from each other at a specific interval LD. As thefirst upper arm 73Ca changes from the second state to the first state,the interval LD between the first upper arm 73Ca and the second upperarm 73Fa may increase.

In this case, when the first upper arm 73Ca changes from the first stateto the second state, there is a problem in that a user's hand may beinjured because the hand is caught between the first upper arm 73Ca andthe second upper arm 73Fa.

In some embodiments, as shown in FIG. 47, when one side of the firstupper arm 73Ca extends and overlaps the second upper arm 73Fa, althoughthe first upper arm 73Ca changes from the second state to the firststate, the interval between the first upper arm 73Ca and the secondupper arm 73Fa may not be exposed. Accordingly, a danger that a user'shand is caught between the first upper arm 73Ca and the second upper arm73Fa while the first upper arm 73Ca changes from the first state to thesecond state can be prevented.

Referring to FIG. 48, the plurality of magnets 64 may be located on thelink 73. For example, at least one magnet 64 may be located on the firstarm 73 a, and at least one magnet 64 may be located on the second arm 73b. The plurality of magnets 64 may be spaced apart from each other.

The display portion may include a metal material. The display portionmay be closely attached to the link 73 by the magnets 64. Although themagnetic force of any one of the plurality of magnets 64 is weakened,the close adhesion of the display panel and module cover to the link 73can be maintained by the remaining magnets 64.

Referring to FIG. 49, one magnet 64 may be located on each of the firstarm 73 a and the second arm 73 b. In this case, the magnet 64 may have ashape that lengthily extends in the long-side direction of the first arm73 a and the second arm 73 b.

Since the magnet 64 has the shape that lengthily extends in thelong-side direction of the first arm 73 a and the second arm 73 b, thearea of a portion where the link 73 closely adheres to the display paneland the module cover can be increased. Accordingly, an adhesion forcebetween the link 73 and the display panel and the module cover can befurther increased.

Referring to FIG. 50, the magnet 64 may be located in a depressedportion 321 formed in the link 73. The depressed portion 321 may have ashape depressed toward the inside of the link 73. The magnet 64 may becombined with the link 73 by at least one screw 187.

The width LHW of the depressed portion 321 depressed toward the link 73may be the same as or greater than the thickness MGW of the magnet 64.If the thickness MGW of the magnet 64 is greater than the width LHW ofthe depressed portion 321, the display panel 10 and the module cover 15may not close adhere to the link 73. In this case, the display panel 10may be wrinkled or may not be flat.

A panel protection portion 97 may be disposed on the back surface of thedisplay panel 10. The panel protection portion 97 may prevent an impacton the display panel 10, which is attributable to friction with themodule cover 15. The panel protection portion 97 may include a metalmaterial. The panel protection portion 97 may have a very thinthickness. For example, the panel protection portion 97 may have athickness of about 0.1 mm.

Mutual attraction may act between the panel protection portion 97 andthe magnet 64 because the panel protection portion 97 includes a metalmaterial. The module cover 15 located between the panel protectionportion 97 and the link 73 may closely adhere to the magnet 64 althoughit does not include a metal material.

Referring to FIG. 51, if a magnet is not provided on the link 73, themodule cover 15 may be closely attached to the link 73 by the upper bar75 on the upper side and the guide bar on the lower side. A portion thatbelongs to the link 73 and that is located between the upper bar 75 andthe guide bar may not closely adhere to the module cover 15.Alternatively, the central part of the link 73 may not closely adhere tothe module cover 15. The central part of the link 73 may be a portionadjacent to the arm joint 152. In this case, distances APRD1 and APLD2between the module cover 15 and the link 73 may not be constant. In thiscase, the display panel 10 may be bent or curved.

Referring to FIG. 52, if the magnet 64 is located in the depressedportion 321 of the link 73, the module cover 15 may also be closelyattached to the magnet 64 because the magnet 64 attracts the panelprotection portion 97. That is, the central part of the link 73 may beclosely attached to the module cover 15.

Referring to FIGS. 53 and 54, an assistant roller 556 may be spacedapart from the panel roller 143. The assistant roller 556 may beconnected to a protection sheet 472. The protection sheet 472 may haveone end connected to the assistant roller 556 and the other endconnected to the display panel 10. The assistant roller 556 may be woundor unwound by the protection sheet 472. The protection sheet 472 mayinclude non-woven fabric.

The assistant roller 556 may be located adjacent to a portion on whichthe panel roller 143 is wound. The assistant roller 556 may be rotatedin a direction opposite the direction in which the panel roller 143 isrotated. That is, when the panel roller 143 unwinds the display panel10, the assistant roller 556 may wind the protection sheet 472.Furthermore, when the panel roller 143 winds the display panel 10, theassistant roller 556 unwinds the protection sheet 472.

Referring to FIG. 53, if the protection sheet 472 is not used, when thepanel roller 143 winds the module cover 15 and the display panel 10, themodule cover 15 and the display panel 10 may rub against each other. Thedisplay panel 10 may be damaged due to frication with the module cover15.

Referring to FIG. 54, the display panel 10, the module cover 15, and theprotection sheet 472 may be together wound on or unwound from the panelroller 143. When the display panel 10, the module cover 15, and theprotection sheet 472 are wound on the panel roller 154, the protectionsheet 472 may be located between the module cover 15 and the displaypanel 10. The protection sheet 472 can prevent friction between themodule cover 15 and the display panel 10. Damage to the display panel 10can be prevented because the protection sheet 472 prevents frictionbetween the module cover 15 and the display panel 10.

Referring to FIG. 55, the assistant roller 556 may include a fixing cap521, a rotating cap 523, a shaft 547, a coil spring 573, and a rollercover 582.

The coil spring 573 may be disposed within the assistant roller 556. Thelength direction of the coil spring 573 and the length direction of theassistant roller 556 may be parallel.

The fixing cap 521 may be located at one end of the assistant roller556. The fixing cap 521 may be coupled to one end of the coil spring573. The fixing cap 521 may be fixed regardless of the rotation of theroller cover 582. The fixing cap 521 may not rotate.

The rotating cap 523 may be located at the other end of the assistantroller 556. The rotating cap 523 may be coupled to the other end of thecoil spring 573. The rotating cap 523, together with the roller cover582, may be rotated when the roller cover 582 is rotated.

When the roller cover 582 rotates, the fixing cap 521 on one side doesnot rotate, the rotating cap 523 may rotate along with the roller cover582, and the coil spring 573 may be elastically deformed. The coilspring 573 may store energy while being elastically deformed, and mayapply a restoring force to the rotating cap 523. The restoring force ofthe coil spring 573 may act in a direction opposite the rotatingdirection of the rotating cap 523.

Accordingly, as the protection sheet 472 is unwound from the assistantroller 556, a force that winds the protection sheet 472 on the assistantroller 556 again may act on the assistant roller 556. That is, when thedisplay panel is unwound from the panel roller, the protection sheet 472may be wound on the assistant roller 556.

Furthermore, as the protection sheet 472 is wound on the assistantroller 556, a force that unwinds the protection sheet 472 from theassistant roller 556 again may act on the assistant roller 556. That is,when the display panel is wound on the panel roller, the protectionsheet 472 may be unwound from the assistant roller 556.

The shaft 547 may be the central axis of the assistant roller 556. Theshaft 547 may be connected to the fixing cap 521. The coil spring 573may be fit into the shaft 547. The shaft 547 may assist the coil spring573 so that it is stably located within the assistant roller 556.

The roller cover 582 may form an external appearance of the assistantroller 556. The roller cover 582 may accommodate the fixing cap 521, therotating cap 523, the shaft 547, and the coil spring 573. The rollercover 582 may be connected to one end of the protection sheet 472. Thatis, the protection sheet 472 may be wound on the roller cover 582.

Referring to FIG. 56, a radius formed by the panel roller 143 and thedisplay panel 10 wound on the panel roller 143 may be referred to as R1.A value of R1 may vary depending on the degree that the display panel 10is wound on the panel roller 143. The radius of the panel roller 143 maybe referred to as R2.

The panel roller 143 may be fixed within the housing 30. Furthermore,the entrance 30 a of the housing through which the display panel passesmay be fixed within the housing 30. Accordingly, an angle formed by thedisplay panel 10 unwound from the panel roller 143 and the base 31within the housing may vary depending on R1.

If the display panel 10 has been sufficiently unwound from the panelroller 143, a radius formed by the panel roller 143 and the displaypanel 10 wound on the panel roller 143 may be R2. In this case, thedisplay panel 10 may be inclined against the base at an angle A1. If thedisplay panel 10 is inclined against the base, the rising or falling ofthe display panel 10 may become unstable.

Referring to FIG. 57, the guide assembly 731 may be coupled to theassistant roller 556.

The assistant roller 556 can prevent the display panel 10 from incliningwith respect to the base 31. The assistant roller 556 may stably guidethe display panel 10 unwound from the panel roller 143. However, aradius/diameter formed by the assistant roller 556 and the protectionsheet 472 wound on the assistant roller 556 may vary depending on thedegree that the protection sheet 472 is wound on the assistant roller556.

The guide assembly 731 is coupled to the assistant roller 556, and mayadjust the location of the assistant roller 556 depending on the degreethat the protection sheet 472 is wound on the assistant roller 556.Accordingly, the assistant roller 556 can stably guide the display panel10 unwound from the panel roller 143 although a radius/diameter formedby the assistant roller 556 and the protection sheet 472 unwound fromthe assistant roller 556 varies.

The guide assembly 731 may include a guide arm 752, a pin bolt 761, atension spring 764, and a supporter 772. The guide arm 752 may have oneend connected to the assistant roller 556 and the other end connected tothe tension spring 764. The guide arm 752 may be rotated around the pinbolt 761. The pin bolt 761 may be fixed to the housing. The assistantroller 556 is connected to the guide arm 752 and may be rotated aroundthe pin bolt 761.

The tension spring 764 may have one end connected to the guide arm 762and the other end connected to the supporter 772. The supporter 772 maybe fixed to the housing.

When the panel roller 143 is unwound from the display panel 10, theassistant roller 556 may be wound on the protection sheet 472, and aradius/diameter formed by the assistant roller 556 and the protectionsheet 472 wound on the assistant roller 556 may be increased.Furthermore, the assistant roller 556 may be rotated counterclockwisearound the pin bolt 761. In this case, the tension spring 764 may applya force so that the guide arm 752 is rotated clockwise. The tensionspring 764 can prevent the assistant roller 556 from excessivelyrotating counterclockwise around the pin bolt 761.

When the display panel 10 is wound on the roller 143, the protectionsheet 472 may be unwound from the assistant roller 556, and aradius/diameter formed by the assistant roller 556 and the protectionsheet 472 wound on the assistant roller 556 may be decreased.Furthermore, the assistant roller 556 may be rotated clockwise aroundthe pin bolt 761.

In this case, the tension spring 764 can prevent the assistant roller556 from rotating counterclockwise around the pin bolt 761.

Hereinafter, a configuration and operation different from those of theaforementioned embodiments are chiefly described, and the same orsimilar configuration as that of the aforementioned embodiments isomitted in order to avoid redundancy.

Referring to FIG. 58, a motor assembly 810 may be installed on the base31. The base 31 may be the base side of the housing 30. The drivingshafts of the motor assembly 810 may be formed on both sides. The rightdriving shaft and left driving shaft of the motor assembly 810 may berotated in the same direction. Alternatively, the right driving shaftand left driving shaft of the motor assembly 810 may be rotated inopposite directions.

The motor assembly 810 may include a plurality of motors. The pluralityof motors may be connected in series. The plurality of motors mayinclude a first motor 811, a second motor 812, a third motor 813, and afourth motor 814 sequentially disposed from the right side to the leftside. The right driving shaft of the motor assembly 810 may be formed inthe first motor 811. Furthermore, the left driving shaft of the motorassembly 810 may be formed in the fourth motor 814. The motor assembly810 can output high torque because the plurality of motors is connectedin series.

The motor assembly 810 may be connected to lead screws 840 a and 840 b.The lead screws 840 a and 840 b may include a right lead screw 840 aconnected to the right side of the motor assembly 810 and a left leadscrew 840 b connected to the left side of the motor assembly 810. Theright lead screw 840 a may also be referred to as a first lead screw 840a. The left lead screw 840 b may also be referred to as a second leadscrew 840 b.

The right driving shaft of the motor assembly 810 may be connected tothe right lead screw 840 a. Alternatively, the right driving shaft ofthe motor assembly 810 and the right lead screw 840 a may be connectedthrough a right coupling 820 a. Alternatively, the driving shaft of thefirst motor 811 may be connected to the right lead screw 840 a.Alternatively, the driving shaft of the first motor 811 and the rightlead screw 840 a may be connected through the right coupling 820 a. Theright driving shaft may also be referred to as a first driving shaft.The left driving shaft may also be referred to as a second drivingshaft.

The left driving shaft of the motor assembly 810 may be connected to theleft lead screw 840 b. Alternatively, the left driving shaft of themotor assembly 810 and the left lead screw 840 b may be connectedthrough the left coupling 820 b. Alternatively, the driving shaft of thefourth motor 814 may be connected to the left lead screw 840 b.Alternatively, the driving shaft of the fourth motor 814 and the leftlead screw 840 b may be connected through the left coupling 820 b.

The couplings 820 a and 820 b may include the right coupling 820 a thatconnects the right driving shaft of the motor assembly 810 and the rightlead screw 840 a and the left coupling 820 b that connects the leftdriving shaft of the motor assembly 810 and the left lead screw 840 b.

Screw threads may be formed in the lead screws 840 a and 840 b in thelength direction. The screw thread formed in the right lead screw 840 aand the screw thread formed in the left lead screw 840 b may haveopposite directions. Alternatively, the screw thread formed in the rightlead screw 840 a and the screw thread formed in the left lead screw 840b may have the same direction.

Bearings 830 a, 830 b, 830 c, and 830 d may be installed on the base 31.A plurality of the bearings 830 a, 830 b, 830 c, and 830 d may be formedin the length direction of the base 31. The bearings 830 a, 830 b, 830c, and 830 d may include right bearings 830 a, 830 b, 830 c, and 830 ddisposed on the right side of the motor assembly 810 and left bearings830 a, 830 b, 830 c, and 830 d disposed on the left side of the motorassembly 810.

The bearings 830 a, 830 b, 830 c, and 830 d may support the lead screws840 a and 840 b. The lead screws 840 a and 840 b may be connected to thedriving shaft of the motor assembly 810 and may rotate around thedriving shaft. The bearings 830 a, 830 b, 830 c, and 830 d may supportthe lead screws 840 a and 840 b while not hindering the rotation of thelead screws 840 a and 840 b.

The right bearings 830 a, 830 b, 830 c, and 830 d may support the rightlead screw 840 a. The right bearings 830 a, 830 b, 830 c, and 830 d mayinclude the first right bearing 830 a that supports the right side ofthe right lead screw 840 a and the second right bearing 830 b thatsupports the left side of the right lead screw 840 a. The first rightbearing 830 a may also be referred to as a first bearing 830 a. Thesecond right bearing 830 b may also be referred to as a second bearing830 b.

The left bearings 830 a, 830 b, 830 c, and 830 d may support the leftlead screw 840 b. The left bearings 830 a, 830 b, 830 c, and 830 d mayinclude the first left bearing 830 c that supports the right side of theleft lead screw 840 b and the second left bearing 830 d that supportsthe left side of the left lead screw 840 b.

In the bearings 830 a, 830 b, 830 c, and 830 d, the couplings 820 a and820 b, and the motor assembly 810, the first right bearing 830 a, thesecond right bearing 830 b, the right coupling 820 a, the motor assembly810, the left coupling 820 b, the first left bearing 830 c, and thesecond left bearing 830 d may be sequentially disposed from the rightside to the left side.

Referring to FIGS. 59 and 60, the display device may further include aslider 860 a, 860 b. The slider 860 a, 860 b may be coupled to the leadscrews 840 a and 840 b. The lead screws 840 a and 840 b may be disposedto penetrate the slider 860 a, 860 b. A plurality of the sliders 860 aand 860 b may be formed. The sliders 860 a and 860 b may include a rightslider 860 a coupled to the right lead screw 840 a and a left slider 860b coupled to the left lead screw 840 b. The right slider 860 a may alsobe referred to as a first slider 860 a. The left slider 860 b may alsobe referred to as a second slider 860 b.

Screw threads SS may be formed in the inner circumferential surfaces ofthe sliders 860 a and 860 b. The screw threads SS formed in the innercircumferential surfaces of the sliders 860 a and 860 b and screwthreads RS and LS formed in the lead screws 840 a and 840 b may beengaged with each other. The sliders 860 a and 860 b may advance orretreat in the length direction of the lead screws 840 a and 840 b asthe lead screws 840 a and 840 b are rotated.

The right slider 860 a may be engaged with the right lead screw 840 a.As the right lead screw 840 a is rotated, the right slider 860 a mayadvance or retreat between the first right bearing 830 a and the secondright bearing 830 b.

The left slider 860 b may be engaged with the left lead screw 840 b.When the left lead screw 840 b is rotated, the left slider 860 b mayadvance or retreat between the first left bearing 830 c and the secondleft bearing 830 d.

The right slider 860 a may be spaced apart from the symmetry axis “ys”of the motor assembly 810 at a distance RD1. The left slider 860 b maybe spaced apart from the symmetry axis “ys” of the motor assembly 810 ata distance LD1. The distance RD1 and the distance LD1 may have the samelength. That is, the right slider 860 a and the left slider 860 b may besymmetrical to each other based on the symmetry axis “ys” of the motorassembly 810.

The rotating direction of the right driving shaft and the rotatingdirection of the left driving shaft may become the same by the motorassembly 810. Furthermore, the screw thread RS of the right lead screw840 a and the screw thread LS of the left lead screw 840 b may haveopposite directions. Accordingly, if the right slider 860 a moves in the+x-axis direction as the right driving shaft rotates, the left slider860 b may move in the −x-axis direction as the left driving shaftrotates. Alternatively, when the right slider 860 a moves in the −x-axisdirection as the right driving shaft rotates, the left slider 860 b maymove in the +x-axis direction as the left driving shaft rotates.

Referring to FIG. 61, the screw thread RS of the right lead screw 840 aand the screw thread LS of the left lead screw 840 b may have oppositedirections. The right lead screw 840 a may have a pitch PL, and the leftlead screw 840 b may have a pitch PR. The pitch PL of the right leadscrew 840 a and the pitch PR of the left lead screw 840 b may have thesame length.

The output of the right driving shaft and the output of the left drivingshaft may become the same by the motor assembly 810. The rotatingdirection Ra of the right driving shaft and the rotating direction Ra ofthe left driving shaft may be the same. Furthermore, the number ofrevolutions of the right driving shaft per unit time and the number ofrevolutions of the left driving shaft per unit time may be the same.Furthermore, the torque of the right driving shaft and the torque of theleft driving shaft may have the same direction. Furthermore, the amountof torque of the right driving shaft and the amount of torque of theleft driving shaft may be the same.

The right slider 860 a may move from the location where the right slider860 a has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance RD1 to the +x-axis direction as the rightdriving shaft rotates. When the right driving shaft rotates n times, theright slider 860 a may be spaced apart from the symmetry axis “ys” ofthe motor assembly 810 at a distance LD2. In this case, the distance RD1and the distance LD2 may have a difference corresponding to “(the numberof revolutions n)*(the pitch PL of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider860 b has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance LD1 to the −x axis direction as the leftdriving shaft rotates. When the left driving shaft rotates n times, theleft slider 860 b may be spaced apart from the symmetry axis “ys” of themotor assembly 810 at a distance RD2. In this case, the distance LD1 andthe distance RD2 may have a difference corresponding to “(the number ofrevolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL ofthe left slider 860 b are the same, the right slider 860 a and the leftslider 860 b may have the same displacement, but have oppositedirections.

Furthermore, if the initial locations of the right slider 860 a and theleft slider 860 b are symmetrical to the symmetry axis “ys” of the motorassembly 810, the right slider 860 a and the left slider 860 b maybecome distant from each other while maintaining symmetry with respectto the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 62, the right slider 860 a may move from the locationwhere the right slider 860 a has been spaced apart from the symmetryaxis “ys” of the motor assembly 810 at the distance RD2 to the −x axisdirection as the right driving shaft rotates. The rotating direction Rbof the right driving shaft and the rotating direction Rb of the leftdriving shaft may be the same. When the right driving shaft rotates ntimes, the right slider 860 a may be spaced apart from the symmetry axis“ys” of the motor assembly 810 at the distance RD1. In this case, thedistance RD1 and the distance RD2 may have a difference corresponding to“(the number of revolutions n)*(the pitch PR of the right slider 860a).”

The left slider 860 b may move from the location where the left slider860 b has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance LD2 to the +x-axis direction as the leftdriving shaft rotates. When the left driving shaft rotates n times, theleft slider 860 b may be spaced apart from the symmetry axis “ys” of themotor assembly 810 at the distance LD1. In this case, the distance LD1and the distance LD2 may have a difference corresponding to “(the numberof revolutions n)* (the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL ofthe left slider 860 b are the same, the right slider 860 a and the leftslider 860 b may have the same displacement, but have oppositedirections.

Furthermore, if the initial locations of the right slider 860 a and theleft slider 860 b are symmetrical to the symmetry axis “ys” of the motorassembly 810, the right slider 860 a and the left slider 860 b maybecome close to each other while maintaining symmetry with respect tothe symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 63, the motor assembly 810 may make the right drivingshaft Ra and the left driving shaft Rb have opposite rotatingdirections. The screw thread RS of the right lead screw 840 a and thescrew thread LS′ of the left lead screw 840 b may have the samedirection. Accordingly, when the right slider 860 a moves in the +x-axisdirection as the right driving shaft rotates, the left slider 860 b maymove in the +x-axis direction as the left driving shaft rotates.Alternatively, when the right slider 860 a moves in the +x-axisdirection as the right driving shaft rotates, the left slider 860 b maymove in the −x-axis direction as the left driving shaft rotates.

The right lead screw 840 a may have the pitch PR, and the left leadscrew 840 b may have the pitch PL. The pitch PR of the right lead screw840 a and the pitch PL of the left lead screw 840 b may be formed tohave the same length.

The right driving shaft and the left driving shaft may have the sameoutput by the motor assembly 810. The rotating direction of the rightdriving shaft and the rotating direction of the left driving shaft maybe opposite. Furthermore, the number of revolutions of the right drivingshaft per unit time and the number of revolutions of the left drivingshaft per unit time may be the same. Furthermore, the torque of theright driving shaft and the torque of the left driving shaft may haveopposite directions. Furthermore, the amount of torque of the rightdriving shaft and the amount of torque of the left driving shaft may bethe same.

The right slider 860 a may move from the location where the right slider860 a has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance RD1 to the +x-axis direction as the rightdriving shaft rotates. When the right driving shaft rotates n times, theright slider 860 a may be spaced apart from the symmetry axis “ys” ofthe motor assembly 810 at the distance RD2. In this case, the distanceRD1 and the distance RD2 may have a difference corresponding to “(thenumber of revolutions n)*(the pitch PR of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider860 b has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance LD1 to the −x-axis direction as the leftdriving shaft rotates. When the left driving shaft rotates n times, theleft slider 860 b may be spaced apart from the symmetry axis “ys” of themotor assembly 810 at the distance LD2. In this case, the distance LD1and the distance LD2 may have a difference corresponding to “(the numberof revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PL of the right slider 860 a and the pitch PR ofthe left slider 860 b are the same, the right slider 860 a and the leftslider 860 b may have the same displacement, but have oppositedirections.

Furthermore, if the initial locations of the right slider 860 a and theleft slider 860 b are symmetrical to the symmetry axis “ys” of the motorassembly 810, the right slider 860 a and the left slider 860 b maybecome distant from each other while maintaining symmetry with respectto the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 64, the motor assembly 810 may make the right drivingshaft Rb and the left driving shaft Ra have opposite rotatingdirections. The right slider 860 a may move from the location where theright slider 860 a has been spaced apart from the symmetry axis “ys” ofthe motor assembly 810 at the distance RD2 to the −x-axis direction asthe right driving shaft rotates. When the right driving shaft rotates ntimes, the right slider 860 a may be spaced apart from the symmetry axis“ys” of the motor assembly 810 at the distance RD1. In this case, thedistance RD1 and the distance RD2 may have a difference corresponding to“(the number of revolutions n)* (the pitch PR of the right slider 860a).”

The left slider 860 b may move from the location where the left slider860 b has been spaced apart from the symmetry axis “ys” of the motorassembly 810 at the distance LD2 to the +x-axis direction as the leftdriving shaft rotates. When the left driving shaft rotates n times, theleft slider 860 b may be spaced apart from the symmetry axis “ys” of themotor assembly 810 at the distance LD1. In this case, the distance LD1and the distance LD2 may have a difference corresponding to “(the numberof revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL ofthe left slider 860 b are the same, the right slider 860 a and the leftslider 860 b may have the same displacement, but have oppositedirections.

Furthermore, if the initial locations of the right slider 860 a and theleft slider 860 b are symmetrical to the symmetry axis “ys” of the motorassembly 810, the right slider 860 a and the left slider 860 b maybecome close to each other while maintaining symmetry with respect tothe symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 65 to 68, link mounts 920 a and 920 b may beinstalled on the base 31. The link mounts 920 a and 920 b may include aright link mount 920 a spaced apart from the first right bearing 830 ato the right side and a left link mount 920 b spaced apart from thesecond left bearing 830 d to the left side.

Links 910 a and 910 b may be connected to the link mounts 920 a and 920b. The links 910 a and 910 b may include a right link 910 a connected tothe right link mount 920 a and a left link 910 b connected to the leftlink mount 920 b.

The right link 910 a may also be referred to as a first link. The leftlink 910 b may also be referred to as a second link. The right linkmount 920 a may also be referred to as a first link mount 920 a. Theleft link mount 920 b may also be referred to as a second link mount 920b.

The links 910 a and 910 b may include first arms 911 a and 911 b, secondarms 912 a and 912 b, and arm joints 913 a and 913 b, respectively. Oneside of each of the second arms 912 a and 912 b may be pivotallyconnected to each of the link mounts 920 a and 920 b. The other side ofeach of the second arms 912 a and 912 b may be pivotally connected toeach of the arm joints 913 a and 913 b. One side of each of the firstarms 911 a and 911 b may be pivotally connected to each of the armjoints 913 a and 913 b. The other side of each of the first arms 911 aand 911 b may be pivotally connected to each of link brackets 951 a and951 b.

The link brackets 951 a and 951 b may include a right link bracket 951 aconnected to the first arm 911 a of the right link 910 a and a left linkbracket 951 b connected to the first arm 911 b of the left link 910 b.The link brackets 951 a and 951 b may be connected to an upper bar 950.

The upper bar 950 may connect the right link bracket 951 a and the leftlink bracket 951 b.

Rods 870 a and 870 b may connect the sliders 860 a and 860 b and thelinks 910 a and 910 b, respectively. One side of each of the rods 870 aand 870 b may be pivotally connected to each of the sliders 860 a and860 b. The other side of each of the rods 870 a and 870 b may bepivotally connected to each of the second arms 912 a and 912 b. The rods870 a and 870 b may include a right rod 870 a that connects the rightslider 860 a and the second arm 912 a of the right link 910 a and a leftrod 870 b that connects the left slider 860 b and the second arm 912 bof the left link 910 b. The right rod 870 a may also be referred to as afirst rod 870 a. The left rod 870 b may also be referred to as a secondrod 870 b.

More specifically, a structure formed by the right lead screw 840 a, theright slider 860 a, the right rod 870 a, and the right link 910 a isdescribed. The right slider 860 a may include a body 861 a and a rodmount 862 a. The screw thread SS may be formed in the innercircumferential surface of the body 861 a. The screw thread formed inthe body 861 a may be engaged with the screw thread RS of the right leadscrew 840 a. The right lead screw 840 a may penetrate the body 861 a.

The rod mount 862 a may be formed on the right side of the body 861 a.The rod mount 862 a may be pivotally connected to one side of the rightrod 870 a. The rod mount 862 a may include a first rod mount 862 a 1 anda second rod mount 862 a 2. The first rod mount 862 a 1 may be disposedat the front of the right lead screw 840 a. The second rod mount 862 a 2may be disposed at the back of the right lead screw 840 a. The first rodmount 862 a 1 and the second rod mount 862 a 2 may be spaced apart fromeach other. The second rod mount 862 a 2 may be spaced apart from thefirst rod mount 862 a 1 to the −z-axis direction. The right lead screw840 a may be located between the first rod mount 862 a 1 and the secondrod mount 862 a 2.

The rod mount 862 a may be pivotally connected to one side of the rod870 a through a connecting member C1. The connecting member C1 maypenetrate the rod mount 862 a and the right rod 870 a.

The right rod 870 a may be pivotally connected to the second arm 912 athrough a connecting member C2. The connecting member C2 may penetratethe second arm 912 a and the right rod 870 a.

The right rod 870 a may include a transfer portion 871 a connected tothe second arm 912 a of the right link 910 a and a cover 872 a connectedto the rod mount 862 a of the right slider 860 a. The transfer portion871 a may transfer a force, generated when the right slider 860 aadvances or retreats along the right lead screw 840 a, to the right link910 a.

The cover 872 a may include a first plate 873 a disposed at the front ofthe right lead screw 840 a. The first plate 873 a may be disposed in adirection vertical to the base 31. Alternatively, the first plate 873 amay face the right lead screw 840 a.

The cover 872 a may include a second plate 874 a disposed at the back ofthe right lead screw 840 a. The second plate 874 a may be disposed in adirection vertical to the base 31. Alternatively, the second plate 874 amay face the right lead screw 840 a. Alternatively, the second plate 874a may be spaced apart from the first plate 873 a. The right lead screw840 a may be located between the first plate 873 a and the second plate874 a.

The cover 872 a may include a third plate 875 a that connects the firstplate 873 a and the second plate 874 a. The third plate 875 a may beconnected to the transfer portion. The third plate 875 a may be locatedover the right lead screw 840 a.

The cover 872 a may include a fourth plate 876 a that connects the firstplate 873 a and the second plate 874 a. The fourth plate 876 a may beconnected to the third plate 875 a. The fourth plate 876 a may belocated over the right lead screw 840 a.

One side of the first plate 873 a may be connected to the first rodmount 862 a 1. The first plate 873 a and the first rod mount 862 a 1 maybe connected through a connecting member C1′. The other side of thefirst plate 873 a may be connected to the third plate 875 a.

One side of the second plate 874 a may be connected to the second rodmount 862 a 2. The second plate 874 a and the second rod mount 862 a 2may be connected through the connecting member C1. The other side of thesecond plate 874 a may be connected to the third plate 875 a.

When the right slider 860 a moves close to the motor assembly 810, theright lead screw 840 a and the right rod 870 a may come into contactwith each other. When the right lead screw 840 a and the right rod 870 acome into contact with each other, interference may be generatedtherebetween and thus a movement of the right slider 860 a may belimited.

The cover 872 a may provide a space S1 therein. The first plate 873 a,the second plate 874 a, the third plate 875 a, and the fourth plate 876a may form the space S1. When the right slider 860 a moves close to themotor assembly 810, the right lead screw 840 a may be accommodated orescaped into the space Si provided by the cover 872 a. The right slider860 a may move close to the motor assembly 810 due to the space S1provided by the cover 872 a, compared to a case where the cover 872 a isnot present. That is, a movable range of the right slider 860 a can beincreased because the cover 872 a provides the space S1 therein.Furthermore, there is an advantage in that the size of the housing 30can be reduced because the right lead screw 840 a is accommodated in thecover 872 a.

Furthermore, the cover 872 a may limit a minimum value of an angle“theta S” formed by the second arm 912 a and the base 31. When the angle“theta S” is sufficiently small, the third plate 875 a of the cover 872a may come into contact with the second arm 912 a and support the secondarm 912 a. Since the third plate 875 a supports the second arm 912 a, aminimum value of the angle “theta S” can be limited and the sagging ofthe second arm 912 a can be prevented. That is, the cover 872 a may playthe role of a stopper to prevent the sagging of the second arm 912 a.Furthermore, since the third plate 875 a limits a minimum value of theangle “theta S”, an initial load for standing the second arm 912 a canbe reduced.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If the lead screws 840 a and 840 b are driven bythe single motor assembly 810, however, a load applied to the motorassembly 810 to stand the second arms 912 a and 912 b may be excessivelyincreased. In this case, the third plate 875 a may limit a minimum valueof the angle “theta S”, thereby being capable of reducing a load appliedto the motor assembly 810 in order to stand the second arms 912 a and912 b.

A structure formed by the left lead screw 840 b, the left slider 860 b,the left rod 870 b, and the left link 910 b may be symmetrical to thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the right link 910 a. In this case, thesymmetry axis may be the symmetry axis “ys” of the motor assembly 810.

In the present disclosure, the disclosed structure to raise and lowerthe flexible display may be referred to herein as a lift assembly. Thelift assembly may include various components including lever assemblies.The lever assemblies may include various components including aplurality of arms in linkage with each other and may be provided inplurality, e.g., on the left and right sides.

FIGS. 60 and 70 are diagrams showing that the right rod 870 a has beenconnected to a protruding portion 914 a. The protruding portion 914 amay also be referred to as a connecting portion 914 a.

An angle formed by the right rod 870 a and the base 31 may be differentdepending on the location of the connecting portion. An angle formed bythe second arm 912 a and the base 31 may be called an angle “theta S”.If the right slider 860 a is located close to the motor assembly 810within its movable range, the second arm 912 a may be said to be thestate in which it has fully lain down with respect to the base 31. Ifthe second arm 912 a has fully lain down with respect to the base 31,the angle “theta S” may have a minimum value. For example, if the secondarm 912 a has fully lain down with respect to the base 31, the angle“theta S” may have a value close to 0 degree.

When the right slider 860 a moves to the +x-axis direction, the angle“theta S” may gradually increase. Alternatively, when the right slider860 a moves to the +x-axis direction, it may be said that the second arm912 a stands up with respect to the base 31. Alternatively, if the angle“theta S” gradually increases, it may be said that the second arm 912 astands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly810 within the movable range, it may be said that the second arm 912 ahas fully stood up with respect to the base 31. If the second arm 912 ahas fully stood up with respect to the base 31, the angle “theta S” mayhave a maximum value. For example, if the second arm 912 a has fullystood up with respect to the base 31, the second arm 912 a may bevertical to the base 31. Alternatively, if the second arm 912 a hasfully stood up with respect to the base 31, an angle formed by the base31 may have a value close to 90 degrees.

The direction in which an angle “theta S” formed by the second arm 912 aof the right link 910 a and the base 31 increases may be called astanding direction S. Alternatively, the direction in which an angleformed by the second arm 912 a of the left link 910 b and the base 31increases may be called a standing direction S.

If a rod mount 862 a″ is located over the body 861 a, an angle formed bya right rod 870 a″ and the base 31 may be called an angle “theta A”, anda minimum force that is necessary for the right rod 870 a″ to stand thesecond arm 912 a may be called Fa.

If a rod mount 862 a′ is located in the middle height of the body 861 a,an angle formed by the right rod 870 a′ and the base 31 may be called“theta B”, and a minimum force that is necessary for the right rod 870a′ to stand the second arm 912 a may be called Fb.

If the rod mount 862 a is located on the lower side of the body 861 a,an angle formed by the right rod 870 a and the base 31 may be called“theta C”, and a minimum force that is necessary for the right rod 870 ato stand the second arm 912 a may be called Fc.

In this case, a relation “theta A<theta B<theta B” may be establishedwith respect to the same angle “theta S.” Furthermore, a relation“Fc<Fb<Fa” may be established with respect to the same angle “theta S.”

That is, if the second arm 912 a and the base 31 form the same angle, aforce required to stand the second arm 912 a may be reduced as an angleformed by the right rod 870 a and the base 31 increases.

The cover 872 a of the right rod 870 a may provide the space S1 in whichthe right lead screw 840 a can be accommodated, so the rod mount 862 acan be coupled close to the lower side of the body 861 b or the rightlead screw 840 a.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If lead screws 840 a and 840 b are driven by thesingle motor assembly 810, however, a load applied to the motor assembly810 in order to stand the second arms 912 a and 912 b may be excessivelyincreased. In this case, a load applied to the motor assembly 810 inorder to stand the second arm 912 a can be reduced by increasing theangle formed by the right rod 870 a and the base 31.

A structure formed by the left lead screw 840 b, the left slider 860 b,the left rod 870 b, and the second arm 912 b may be symmetrical to thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the second arm 912 a. In this case, thesymmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 71 to 73, the second arm 912 a and 912 a′ may includea bar 915 a and 915 a′ and a protruding portion 914 a. FIG. 71 is adiagram showing that the right rod 870 a′ has been connected to the bar915 a′. FIG. 72 is a diagram showing that the right rod 870 a has beenconnected to the protruding portion 914 a. The protruding portion 914 amay also be referred to as a connecting portion 914 a.

An angle formed by the second arm 912 a and 912 a′ and the base 31 maybe called “theta S.” If the right slider 860 a is located closest to themotor assembly 810 within its movable range, it may be said to be thestate in which the second arm 912 a and 912 a′ has fully lain down withrespect to the base 31. If the second arm 912 a has fully lain down withrespect to the base 31, the angle “theta S” may have a minimum value.For example, if the second arm 912 a and 912 a′ has fully lain down withrespect to the base 31, the angle “theta S” may have a value close to 0degree.

When the right slider 860 a moves to the +x-axis direction, the angle“theta S” may gradually increase. Alternatively, when the right slider860 a moves to the +x-axis direction, it may be said that the second arm912 a and 912 a′ stands up with respect to the base 31. Alternatively,when the angle “theta S” gradually increases, it may be said that thesecond arm 912 a stands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly810 within the movable range, it may be said that the second arm 912 aand 912 a′ has fully stood up with respect to the base 31. If the secondarm 912 a has fully stood up with respect to the base 31, the angle“theta S” may have a maximum value. For example, if the second arm 912 aand 912 a′ has fully stood up with respect to the base 31, the secondarm 912 a and 912 a′ may be vertical to the base 31. Alternatively, ifthe second arm 912 a and 912 a′ has fully stood up with respect to thebase 31, an angle formed by the base 31 may have a value close to 90degrees.

The direction in which the angle “theta S” formed by the second arm 912a and 912 a′ of the right link 910 a and the base 31 increases may becalled a standing direction S. Alternatively, the direction in which theangle formed by the second arm 912 a of the left link 910 b and the base31 increases may be called a standing direction S.

Referring to FIG. 71, an angle formed by the right rod 870 a and theright lead screw 840 a may be called “theta 1.” If the second arm 912 a′has fully lain down with respect to the base 31, the angle “theta 1” mayhave a minimum value.

In order to stand the second arm 912 a′, the motor assembly 810 mayrotate the driving shaft. When the driving shaft rotates, the rightslider 860 a may move to the +x-axis direction. The right slider 860 amay apply a force to the right rod 870 a′, and the rod 870 a′ maytransfer the force to the bar 915 a′ of the second arm 912 a′. Thesecond arm 912 a′ may receive the force from the right rod 870 a′ androtate to the standing direction S. When the right link 910 a stands up,the angle “theta S” and the angle “theta 1” may increase.

If the second arm 912 a′ has fully lain down with respect to the base31, a minimum force for standing the second arm 912 a′ may be called F1.That is, the minimum force F1 may mean a minimum force that needs to betransferred from the right rod 870 a′ to the bar 915 a′ of the secondarm 912 a′ in order to stand the second arm 912 a′.

Referring to FIG. 72, an angle formed by the right rod 870 a and theright lead screw 840 a may be called “theta 2.” If the second arm 912 ahas fully lain down with respect to the base 31, the angle “theta 2” mayhave a minimum value.

In order to stand the second arm 912 a, the motor assembly 810 mayrotate the driving shaft. When the driving shaft rotates, the rightslider 860 a may move to the +x-axis direction and the left slider 860 bmay move to the −x-axis direction. The sliders 860 a and 860 b may applya force to the rods 870 a and 870 b, and the rods 870 a and 870 b maytransfer the force to the bar 915 a of the second arm 912 a. The secondarm 912 a may receive the force from the rods 870 a and 870 b and rotateto the standing direction S. When the links 910 a and 910 b stand up,the angle “theta S” and the angle “theta 2” may increase.

If the second arm 912 a has fully lain down with respect to the base 31,a minimum force for standing the second arm 912 a may be called F2. Thatis, the minimum force F2 may mean a minimum force that needs to betransferred from the right rod 870 a to the bar 915 a of the second arm912 a in order to stand the second arm 912 a.

The case where the right rod 870 a′ is connected to the bar 915 a′ ofthe second arm 912 a′ and the case where the right rod 870 a isconnected to the protruding portion 914 a of the second arm 912 a arecompared with each other with reference to FIGS. 47 and 48. If an angle“theta S” formed by the second arm 912 a and 912 a′ and the base 31 isthe same, an angle “theta 2” formed by the right lead screw 840 a andthe right rod 870 a connected to the protruding portion 914 a of thesecond arm 912 a may be greater than an angle “theta 1” formed by theright lead screw 840 a and the right rod 870 a′ connected to the bar 915a′ of the second arm 912 a′.

Furthermore, if an angle “theta S” formed by the second arm 912 a and912 a′ and the base 31 is the same, the force F1 necessary to stand thesecond arm 912 a′ if the right rod 870 a′ has been connected to the bar915 a′ of the second arm 912 a′ may be greater than the force F2necessary to stand the second arm 912 a if the right rod 870 a has beenconnected to the protruding portion 914 a of the second arm 912 a.

That is, if an angle formed by the second arm 912 a and 912 a′ and thebase 31 is the same, a force required to stand the second arm 912 a and912 a′ may be reduced as an angle formed by the right rod 870 a, 870 a′and the right lead screw 840 a increases. Alternatively, since the rightrod 870 a is connected to the protruding portion 914 a, the second arm912 a can be stood up by a small force compared to a case where theright rod 870 a′ is connected to the bar 915 a′.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If the lead screws 840 a and 840 b are driven bythe single motor assembly 810, however, a load applied to the motorassembly 810 in order to stand the second arms 912 a and 912 b may beexcessively increased. In this case, since the right rod 870 a isconnected to the protruding portion 914 a of the second arm 912 a, anangle formed by the right rod 870 a and the base 31 may be increased. Aload applied to the motor assembly 810 may be reduced in order to standthe second arm 912 a.

A structure formed by the left lead screw 840 b, the left slider 860 b,the left rod 870 b, and the second arm 912 b may be symmetrical to thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the second arm 912 a. In this case, thesymmetry axis may be the symmetry axis “ys” of the motor assembly 810.

FIGS. 74 and 75 are diagrams showing that the right rod 870 a has beenconnected to the protruding portion 914 a. The protruding portion 914 amay also be referred to as a connecting portion 914 a.

An angle formed by the right rod 870 a and the base 31 may be differentdepending on the location where the protruding portion 914 a and theright rod 870 a are connected. An angle formed by the second arm 912 aand the base 31 may be called “theta S.” If the right slider 860 a islocated closest to the motor assembly 810 within its movable range, itmay be said to be the state in which the second arm 912 a has fully laindown with respect to the base 31. If the second arm 912 a has fully laindown with respect to the base 31, the angle “theta S” may have a minimumvalue. For example, if the second arm 912 a has fully lain down withrespect to the base 31, the angle “theta S” may have a value close to 0degree.

When the right slider 860 a moves to the +x-axis direction, the angle“theta S” may gradually increase. Alternatively, when the right slider860 a moves to the +x-axis direction, it may be said that the second arm912 a stands up with respect to the base 31. Alternatively, when theangle “theta S” gradually increases, it may be said that the second arm912 a stands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly810 within the movable range, it may be said to be the state in whichthe second arm 912 a has fully stood up with respect to the base 31. Ifthe second arm 912 a has fully stood up with respect to the base 31, theangle “theta S” may have a maximum value. For example, if the second arm912 a has fully stood up with respect to the base 31, the second arm 912a may be vertical to the base 31. Alternatively, if the second arm 912 ahas fully stood up with respect to the base 31, an angle formed by thebase 31 may have a value close to 90 degrees.

The direction in which the angle “theta S” formed by the second arm 912a of the right link 910 a and the base 31 increases may be called astanding direction S. Alternatively, the direction in which the angleformed by the second arm 912 a of the left link 910 b and the base 31increases may be called a standing direction S.

If a right rod 870 a 1 and the protruding portion 914 a are coupledtogether at a distance “r” from the central axis CR of the second arm912 a, an angle formed by the right rod 870 a 1 and the base 31 may becalled “theta 2”, and a minimum force that is necessary for the rightrod 870 a 1 to stand the second arm 912 a may be called F3.

If a right rod 870 a 2 and the protruding portion 914 a are coupledtogether at a distance r′ from the central axis CR of the second arm 912a, an angle formed by the right rod 870 a 2 and the base 31 may becalled theta 2′, and a minimum force that is necessary for the right rod870 a 2 to stand the second arm 912 a may be called F4.

If a right rod 870 a 3 and the protruding portion 914 a are coupledtogether at a distance r″ from the central axis CR of the second arm 912a, an angle formed by the right rod 870 a 3 and the base 31 may becalled theta 2″, and a minimum force that is necessary for the right rod870 a 3 to stand the second arm 912 a may be called F5.

In this case, a relation “theta 2<theta 2′<theta 2″” may be establishedwith respect to the same angle “theta S.” Furthermore, a relation“F5<F4<F3” may be established with respect to the same angle “theta S.”

That is, if an angle formed by the second arm 912 a and the base 31 isthe same, a force required to stand the second arm 912 a may bedecreased as an angle formed by the right rod 870 a and the base 31increases.

A structure formed by the left lead screw 840 b, the left slider 860 b,the left rod 870 b, and the second arm 912 b may be symmetrical to thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the second arm 912 a. In this case, thesymmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 76, a guide 850 a, 850 b, 850 c, and 850 d may beconnected to a bearing 830 a, 830 b, 830 c, and 830 d. The guide 850 a,850 b, 850 c, and 850 d may include right guides 850 a and 850 bdisposed on the right side of the motor assembly 810 and left guides 850c and 850 d disposed on the left side of the motor assembly 810.

The right guide 850 a and 850 b may have one side connected to the firstright bearing 830 a and the other side connected to the second rightbearing 830 b. The right guide 850 a and 850 b may be located inparallel to the right lead screw 840 a. Alternatively, the right guide850 a and 850 b may be spaced apart from the right lead screw 840 a.

The right guide 850 a and 850 b may include a first right guide 850 aand a second right guide 850 b. The first right guide 850 a and thesecond right guide 850 b may be spaced apart from each other. The rightlead screw 840 a may be located between the first right guide 850 a andthe second right guide 850 b.

The right slider 860 a may include a protruding portion. Alternatively,the display device may include a protruding portion formed in the rightslider 860 a. The protruding portion may be formed in the body of theslider. The protruding portion may include a front protruding portionthat protrudes from the body 861 a of the right slider 860 a to the+z-axis direction and a back protruding portion 865 a that protrudesfrom the body of the slider to the −z-axis direction.

The first right guide 850 a may penetrate the back protruding portion865 a. Alternatively, a first hole 863 a may be formed in the backprotruding portion, and the first right guide 850 a may pass through thefirst hole 863 a. The first hole 863 a may be formed in the x-axisdirection. The first hole 863 a may also be referred to as a hole 863 a.

The second right guide may penetrate the front protruding portion.Alternatively, a second hole may be formed in the front protrudingportion, and the second right guide may penetrate the second hole. Thesecond hole may be formed in the x-axis direction.

The right guides 850 a and 850 b may guide the right slider 860 a sothat it moves more stably when the right slider 860 a advances orretreats along the right lead screw 840 a. Since the right guides 850 aand 850 b stably guide the right slider 860 a, the right slider 860 amay advance or retreat along the right lead screw 840 a without rotatingwith respect to the right lead screw 840 a.

A structure formed by the left guides 850 c and 850 d, the left bearings830 a, 830 b, 830 c, and 830 d, the left slider 860 b, and the left leadscrew 840 b may be symmetrical to the structure formed by the rightguides 850 a and 850 b, the right bearings 830 a, 830 b, 830 c, and 830d, the right slider 860 a, and the right lead screw 840 a. In this case,the symmetry axis may be the symmetry axis “ys” of the motor assembly810.

Referring to FIG. 77, first springs 841 a and 841 b may be inserted intothe lead screws 840 a and 840 b. Alternatively, the lead screws 840 aand 840 b may penetrate the first springs 841 a and 841 b. The firstsprings 841 a and 841 b may include a first right spring 841 a disposedon the right side of the motor assembly 810 and a first left spring 841b disposed on the left side of the motor assembly 810.

The first right spring 841 a may be disposed between the right slider860 a and the second right bearing 830 b. One end of the first rightspring 841 a may be brought into contact with or separated from theright slider 860 a. The other end of the first right spring 841 a may bebrought into contact with or separated from the second right bearing 830b.

If the second arm 912 a has fully lain down with respect to the base 31,the distance between the right slider 860 a and the second right bearing830 b may be a distance RD3. The first right spring 841 a may have alonger length than the distance RD3 in the state in which the firstright spring 841 a has not been compressed or extended. Accordingly, ifthe second arm 912 a has fully lain down with respect to the base 31,the first right spring 841 a may be compressed between the right slider860 a and the second right bearing 830 b. Furthermore, the first rightspring 841 a may provide a restoring force to the right slider 860 a inthe +x-axis direction.

If the second arm 912 a changes from the state in which it has fullylain down with respect to the base 31 to the standing state, a restoringforce provided by the first right spring 841 a may assist the second arm912 a to stand up. A load of the motor assembly 810 can be reducedbecause the first right spring 841 a assists the second arm 912 a tostand up.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If the lead screws 840 a and 840 b are driven bythe single motor assembly 810, however, a load applied to the motorassembly 810 in order to stand the second arms 912 a and 912 b may beexcessively increased. In this case, since the first right spring 841 aassists the second arm 912 a to stand up, a load of the motor assembly810 can be reduced and a load applied to the motor assembly 810 in orderto stand the second arm 912 a can be reduced.

Alternatively, if the second arm 912 a changes from the state in whichhit has stood up with respect to the base 31 to the state in which ithas fully lain down, a restoring force provided by the first rightspring 841 a can reduce an impact generated when the second arm 912 alies down with respect to the base 31. That is, when the second arm 912a lies down with respect to the base 31, the first right spring 841 aplays the role of a damper. A load of the motor assembly 810 can bereduced because the first right spring 841 a plays the role of a damper.

A structure formed by the first left spring 841 b, the left bearings 830a, 830 b, 830 c, and 830 d, the left slider 860 b, the left lead screw840 b, and the second arm 912 a may be symmetrical to the structureformed by the first right spring 841 a, the right bearings 830 a, 830 b,830 c, and 830 d, the right slider 860 a, the right lead screw 840 a,and the second arm 912 a. In this case, the symmetry axis may be thesymmetry axis “ys” of the motor assembly 810.

Referring to FIG. 78, second springs 851 a and 851 b may be insertedinto the guides 850 a, 850 b, 850 c, and 850 d. Alternatively, theguides 850 a, 850 b, 850 c, and 850 d may penetrate the second springs851 a and 851 b. The second springs 851 a and 851 b may include a secondright spring 851 a disposed on the right side of the motor assembly 810and a second left spring 851 b disposed on the left side of the motorassembly 810.

A plurality of the second right springs 851 a may be formed. The secondright spring 851 a may include springs 940 a and 940 b inserted into thefirst right guide 850 a and springs 940 a and 940 b inserted into thesecond right guide 850 b. Alternatively, the second right spring 851 amay include springs 940 a and 940 b through which the first right guide850 a penetrates and springs 940 a and 940 b through which the secondright guide 850 b penetrates.

The guides 850 a, 850 b, 850 c, and 850 d may include lockingprotrusions 852 a and 852 b. The locking protrusions 852 a and 852 b mayinclude a right locking protrusion 852 a disposed on the right side ofthe motor assembly 810 and a left locking protrusion 852 b disposed onthe left side of the motor assembly 810.

The right locking protrusion 852 a may be disposed between the rightslider 860 a and the second right bearing 830 b. Furthermore, the secondright spring 851 a may be disposed between the right slider 860 a andthe second right bearing 830 b. One end of the second right spring 851 amay be brought into contact with or separated from the right slider 860a. The other end of the second right spring 851 a may be brought intocontact with or separated from the right locking protrusion 852 a.

If the second arm 912 a has fully lain down with respect to the base 31,the distance between the right slider 860 a and the right lockingprotrusion 852 a may be a distance RD4. The second right spring 851 amay have a length greater than the distance RD4 in the state in which ithas not been compressed or extended. Accordingly, if the second arm 912a has fully lain down with respect to the base 31, the second rightspring 851 a may be compressed between the right slider 860 a and theright locking protrusion 852 a. Furthermore, the second right spring 851a may provide a restoring force to the right slider 860 a in the +x-axisdirection.

If the second arm 912 a changes from the state in which it has fullylain down with respect to the base 31 to the standing state, a restoringforce provided by the second right spring 851 a may assist the secondarm 912 a to stand up. A load of the motor assembly 810 can be reducedbecause the second right spring 851 a assists the second arm 912 a tostand up.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If the lead screws 840 a and 840 b are driven bythe single motor assembly 810, however, a load applied to the motorassembly 810 in order to stand the second arms 912 a and 912 b may beexcessively increased. In this case, since the second right spring 851 aassists the second arm 912 a to stand up, a load of the motor assembly810 can be reduced and a load applied to the motor assembly 810 in orderto stand the second arm 912 a can be reduced.

Alternatively, if the second arm 912 a changes from the state in whichit has fully stood up with respect to the base 31 to the state in whichit has fully lain down, a restoring force provided by the second rightspring 851 a can reduce an impact generated when the second arm 912 alies down with respect to the base 31. That is, when the second arm 912a lies down with respect to the base 31, the second right spring 851 aplays the role of a damper. A load of the motor assembly 810 can bereduced because the second right spring 851 a plays the role of adamper.

A structure formed by the second left spring 851 b, the left lockingprotrusion 852 b, the left slider 860 b, the left guides 850 c and 850d, and the second arm 912 a may be symmetrical to the structure formedby the second right spring 851 a, the right locking protrusion 852 a,the right slider 860 a, the right guides 850 a and 850 b, and the secondarm 912 a. In this case, the symmetry axis may be the symmetry axis “ys”of the motor assembly 810.

Referring to FIGS. 79 to 81, the second arm 912 a may stand up byrestoring forces provided by the first right spring 841 a and the secondright spring 851 a.

An angle formed by the second arm 912 a and the base 31 may be called“theta S.” An angle formed by the right rod 870 a and the base 31 may becalled “theta T.” A force by which the motor assembly 810 moves theright slider 860 a to the +x-axis direction may be called FA. A forcethat is applied from the first right spring 841 a to the right slider860 a may be called FB. A force that is applied from the second rightspring 851 a to the right slider 860 a may be called FC. A force that istransferred from the right rod 870 a to the second arm 912 a may becalled FT.

If the second arm 912 a has fully lain down with respect to the base 31,the angle “theta S” and the angle “theta T” may have a minimum value. Ifthe second arm 912 a changes from the state in which it has fully laindown with respect to the second base 31 to the standing state, the angle“theta S” and the angle “theta T” may gradually increase.

If the second arm 912 a has fully lain down with respect to the base 31,the first right spring 841 a may be compressed. The compressed firstright spring 841 a may provide the restoring force FB to the rightslider 860 a. The restoring force FB may act in the +x direction. If thesecond arm 912 a has fully lain down with respect to the base 31,compression displacement of the first right spring 841 a may be amaximum, and the restoring force FB may have a maximum value. If thesecond arm 912 a changes from the state in which it has fully lain downwith respect to the base 31 to the standing state, compressiondisplacement of the first right spring 841 a may be gradually decreased,and the amount of the restoring force FB may be gradually decreased.

If the second arm 912 a has fully lain down with respect to the base 31,the second right spring 851 a may be compressed. The compressed secondright spring 851 a may provide the restoring force FC to the rightslider 860 a. The restoring force FC may act in the +x direction. If thesecond arm 912 a has fully lain down with respect to the base 31,compression displacement of the second right spring 851 a may be amaximum, and the restoring force FC may have a maximum value. If thesecond arm 912 a changes from the state in which it has fully lain downwith respect to the base 31 to the standing state, compressiondisplacement of the second right spring 851 a may be graduallydecreased, and the amount of the restoring force FC may be graduallydecreased.

The force FT that is transferred from the right rod 870 a to the secondarm 912 a may be the resultant force of the force FA by which the motorassembly 810 moves the right slider 860 a to the +x-axis direction, therestoring force FB of the first right spring 841 a, and the restoringforce FC of the second right spring 851 a.

If the second arm 912 a starts to stand up in the state in which thesecond arm 912 a has fully lain down with respect to the base 31, a loadof the motor assembly 810 may be a maximum. In this case, the restoringforce FB provided by the first right spring 841 a may be a maximum.Furthermore, the restoring force FC provided by the second springs 851 aand 851 b may be a maximum.

If the second arm 912 a changes from the state in which it has fullylain down with respect to the base 31 to the standing state, therestoring forces provided by the first right spring 841 a and the secondright spring 851 a may assist the second arm 912 a to stand up. A loadof the motor assembly 810 can be reduced because the first right spring841 a and the second right spring 851 a assist the second arm 912 a tostand up.

The first right spring 841 a and the second right spring 851 a mayprovide restoring forces (i.e., the resultant force of the restoringforce FB and the restoring force FC) to the right slider 860 a at thesame time. The restoring forces (i.e., the resultant force of therestoring force FB and the restoring force FC) may be provided to theright slider 860 a until a distance RD5 between the right slider 860 aand the right locking protrusion 852 a becomes equal to the length ofthe second right spring 851 a.

When the distance RD5 between the right slider 860 a and the rightlocking protrusion 852 a becomes equal to the length of the second rightspring 851 a, compression displacement of the second right spring 851 amay become 0. When compression displacement of the second right spring851 a becomes 0, the restoring force FC that is provided from the secondright spring 851 a to the right slider 860 a may become 0.

If the distance RD5 between the right slider 860 a and the right lockingprotrusion 852 a becomes greater than the length of the second rightspring 851 a, only the first right spring 841 a may provide therestoring force FB to the right slider 860 a. The restoring force FB maybe provided to the right slider 860 a until a distance RD6 between theright slider 860 a and the second right bearing 830 b becomes equal tothe length of the first right spring 841 a.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b becomes equal to the first right spring 841 a,compression displacement of the first right spring 841 a may become 0.When compression displacement of the first right spring 841 a becomes 0,the restoring force FB that is provided from the first right spring 841a to the right slider 860 a may become 0.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b becomes greater than the length of the first rightspring 841 a, the motor assembly 810 may stand the second arm 912 awithout using a restoring force provided by the first right spring 841 aor the second right spring 851 a.

A structure formed by the first left spring 841 b, the second leftspring 851 b, the left locking protrusion 852 b, the left slider 860 b,the left guides 850 c and 850 d, the left lead screw 840 b, the left rod870 b, and the second arm 912 a may be symmetrical to the structureformed by the first right spring 841 a, the second right spring 851 a,the right locking protrusion 852 a, the right slider 860 a, the rightguides 850 a and 850 b, the right lead screw 840 a, the right rod 870 a,and the second arm 912 a. In this case, the symmetry axis may be thesymmetry axis “ys” of the motor assembly 810.

Referring to FIG. 82, pushers 930 a and 930 b may be connected to thelink mounts 920 a and 920 b. The pushers 930 a and 930 b may include aright pusher 930 a disposed on the right side of the motor assembly 810and a left pusher 930 b disposed on the left side of the motor assembly810. The pushers 930 a and 930 b may be referred to herein as elasticmembers.

The link mounts 920 a and 920 b may form an accommodation space A. Theaccommodation space A may accommodate springs 940 a and 940 b and thepushers 930 a and 930 b. The springs 940 a and 940 b may include theright spring 940 a disposed on the right side of the motor assembly 810and the left spring 940 b disposed on the left side of the motorassembly 810. The accommodation space A may also be referred to as aninternal space A.

The link mount 920 a and 920 b may include a first hole 922 a (e.g., afirst hole for the link mounts 920 a and 920 b) that connects theaccommodation space A and an external space. The first hole 922 a may beformed in the top surface of the link mounts 920 a and 920 b. The firsthole 922 a may also be referred to as a hole 922 a.

The pushers 930 a and 930 b may be disposed in a direction vertical tothe base 31. Alternatively, the pushers 930 a and 930 b may be disposedin parallel to the y axis. The springs 940 a and 940 b may be located ina direction vertical to the base 31. Alternatively, the springs 940 aand 940 b may be disposed in a direction parallel to the y axis.

The pushers 930 a and 930 b may include first parts 931 a and 931 b andsecond parts 932 a and 932 b, respectively. The second parts 932 a and932 b may be connected to the lower sides of the first parts 931 a and931 b. The bottoms of the second parts 932 a and 932 b may be connectedto the springs 940 a and 940 b. Some of or the entire second parts 932 aand 932 b may be accommodated in the accommodation space A formed by thelink mounts 920 a and 920 b. Each of the second parts 932 a and 932 bmay have the same diameter as the first hole 922 a or may have a smallerdiameter than the first hole 922 a. The second parts 932 a and 932 b maypass through the first hole 922 a.

The first parts 931 a and 931 b may be located outside the link mounts920 a and 920 b. Alternatively, the first parts 931 a and 931 b may belocated outside the accommodation space A of the link mounts 920 a and920 b. Each of the first parts 931 a and 931 b may have a greaterdiameter than the first hole 922 a.

The first parts 931 a and 931 b may be brought into contact with anupper surface of the display screen. For example, the first parts 931 aand 931 b may contact the upper bar and/or the link brackets 951 a and951 b or may be spaced apart from each other. For example, if the secondarms 912 a and 912 b have fully lain down with respect to the base 31,the first parts 931 a and 931 b may come into contact with the linkbrackets 951 a and 951 b. Alternatively, if the second arms 912 a and912 b have fully stood up with respect to the base 31, the first parts931 a and 931 b may be spaced apart from the link brackets 951 a and 951b.

If the first parts 931 a and 931 b come into contact with the linkbrackets 951 a and 951 b, forces from the link brackets 951 a and 951 bmay be applied to the pushers 930 a and 930 b. The forces applied to thepushers 930 a and 930 b may be downward. Alternatively, the forcesapplied to the pushers 930 a and 930 b may be the −y-axis direction.Alternatively, the link brackets 951 a and 951 b may pressurize thepushers 930 a and 930 b. The direction in which the link brackets 951 aand 951 b pressurize the pushers 930 a and 930 b may be downward.Alternatively, the direction in which the link brackets 951 a and 951 bpressurize the pushers 930 a and 930 b may be the −y-axis direction.

When the forces are applied to the first parts 931 a and 931 b, thesprings 940 a and 940 b may be compressed. The compressed springs 940 aand 940 b may provide restoring forces to the pushers 930 a and 930 b.The restoring forces may have a direction opposite the direction inwhich the forces are applied to the first parts 931 a and 931 b.Alternatively, the restoring force may act in the +y-axis direction.

The link mount 920 a and 920 b may include a second hole 921 a (e.g., asecond hole for the link mounts 920 a and 920 b). The second hole 921 amay connect the accommodation space A and an external space. Some of orthe entire springs 940 a and 940 b may be exposed to the outside throughthe second hole 921 a. Some of or the entire pushers 930 a and 930 b maybe exposed to the outside through the second hole 921 a. When thedisplay device is to be maintained or repaired, a service provider maycheck the operating state of the pushers 930 a and 930 b through thesecond hole 921 a. The second hole 921 a may provide a service providerwith maintenance or repair convenience.

Referring to FIGS. 83 to 85, the right link 910 a may stand up by therestoring force provided by the right pusher 930 a. The right link 910 ais described below, for example.

An angle formed by the second arm 912 a and the base 31 may be called“theta S.” A force that is transferred from the right rod 870 a to thesecond arm 912 a may be called FT. A force that is transferred from theright pusher 930 a to the right link bracket 951 a may be called FP.

Referring to FIG. 83, if the second arm 912 a has fully lain down withrespect to the base 31, the angle “theta S” may have a minimum value.The right spring 940 a connected to the right pusher 930 a may becompressed to as much as possible, and the amount of the restoring forceFP may have a maximum value. The compressed right spring 940 a mayprovide the restoring force FP to the right pusher 930 a. The rightpusher 930 a may transfer the restoring force FP to the right linkbracket 951 a. The restoring force FP may act in the +y-axis direction.

If the second arm 912 a has fully lain down with respect to the base 31,the distance HL from the base 31 to the top of the right pusher 930 amay have a minimum value. The first part 931 a of the right pusher 930 amay protrude to the outside the right link mount 920 a. The second part932 a of the right pusher 930 a may be fully accommodated in theaccommodation space 923 a of the right link mount 920 a.

Referring to FIG. 84, if the second arm 912 a changes from the state inwhich it has fully lain down with respect to the base 31 to the standingstate, the angle “theta S” may gradually increase. Compressiondisplacement of the right spring 940 a may be gradually decreased, andthe amount of the restoring force FP may gradually decrease.

As the angle “theta S” gradually increases, at least part of the secondpart 932 a of the right pusher 930 a may be protruded to the outside ofthe right link mount 920 a. The length in which the second part 932 a ofthe right pusher 930 a has protruded to the outside of the right linkmount 920 a may be referred to as HP. The distance HL from the base 31to the top of the right pusher 930 a may be increased by the length HPcompared to a case where the second arm 912 a has fully lain down withrespect to the base 31.

Referring to FIG. 85, when the standing up of the second arm 912 a withrespect to the base 31 is in progress, the right pusher 930 a and theright link bracket 951 a may be separated from each other. In this case,compression displacement of the right spring 940 a may become 0. Whencompression displacement of the right spring 940 a becomes 0, therestoring force FP that is provided from the right pusher 930 a to theright link bracket 951 a may become 0. For example, the right pusher 930a may extend initially and a fraction of a total distance in which thearms 911 a and 912 a must move to fully extend the flexible display. Asillustrated, for example, in FIG. 61, a length of the first portion 931a in the vertical direction is smaller than a height of the link mount920 a in the vertical direction such that the first portion 931 a nolonger makes contact after the initial phase of the movement.

Furthermore, the length HP in which the second part 932 a of the rightpusher 930 a has protruded to the outside of the right link mount 920 amay have a maximum value. Furthermore, the distance HL from the base 31to the top of the right pusher 930 a may have a maximum value.

That is, while the right pusher 930 a comes into contact with the rightlink bracket 951 a, the restoring force may be applied to the right linkbracket 951 a. Accordingly, the restoring force can assist the secondarm 912 a to stand up and can reduce a load of the motor assembly 810.

The lead screws 840 a and 840 b may be driven by the single motorassembly 810. Since the lead screws 840 a and 840 b are driven by thesingle motor assembly 810, the second arms 912 a and 912 b can stand upwhile forming symmetry. If the lead screws 840 a and 840 b are driven bythe single motor assembly 810, however, a load applied to the motorassembly 810 in order to stand the second arms 912 a and 912 b may beexcessively increased. In this case, since the right pusher 930 aapplies the restoring force to the right link bracket 951 a, therestoring force can assist the second arm 912 a to stand up and canreduce a load of the motor assembly 810.

Alternatively, if the second arm 912 a changes from the state in whichit has stood up with respect to the base 31 to the state in which it hasfully lain down, the restoring force that is provided from the rightpusher 930 a to the right link bracket 951 a can reduce an impactgenerated when the link 910 a lies down with respect to the base 31.That is, the restoring force that is provided from the right pusher 930a to the right link bracket 951 a plays the role of a damper when thelink 910 a lies down with respect to the base 31. A load of the motorassembly 810 can be reduced because the right pusher 930 a plays therole of a damper.

A structure formed by the left pusher 930 b, the left spring 940 b, theleft link bracket 951 b, the left link mount 920 b, and the left rod 870b may be symmetrical to the structure formed by the right pusher 930 a,the right spring 940 a, the right link bracket 951 a, the right link 910a, and the right rod 870 a. In this case, the symmetry axis may be thesymmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 86 to 88, the panel roller 143 may be installed onthe base 31. The panel roller 143 may be disposed at the front of thelead screws 840 a and 840 b. Alternatively, the panel roller 143 may bedisposed in parallel to the length direction of the lead screws 840 aand 840 b. Alternatively, the panel roller 143 may be spaced apart fromthe lead screws 840 a and 840 b.

The display portion 20 may include the display panel 10 and the modulecover 15. The lower side of the display portion 20 may be connected tothe panel roller 143, and the upper side of the display portion 20 maybe connected to the upper bar 75. The display portion 20 may be wound onor unwound from the panel roller 143.

A distance from the symmetry axis “ys” of the motor assembly 810 to theright slider 860 a may be called a distance RD. A distance from thesymmetry axis “ys” of the motor assembly 810 to the left slider 860 bmay be called a distance LD. The distance between the right slider 860 aand the left slider 860 b may be called a distance SD. The distance SDmay be the sum of the distance RD and the distance LD. A distance fromthe base 31 to the top of the display portion 20 may be called adistance HD.

Referring to FIG. 86, if the second arms 912 a and 912 b have fully laindown with respect to the base 31, the distance SD between the rightslider 860 a and the left slider 860 b may have a minimum value. Thedistance RD from the symmetry axis “ys” of the motor assembly 810 to theright slider 860 a and the distance LD from the symmetry axis “ys” ofthe motor assembly 810 to the left slider 860 b may be the same.

If the second arms 912 a and 912 b have fully lain down with respect tothe base 31, the distance HD from the base 31 to the top of the displayportion 20 may have a minimum value.

If the second arms 912 a and 912 b have fully lain down with respect tothe base 31, the first springs 841 a and 841 b may come into contactwith the sliders 860 a and 860 b. Furthermore, the second springs 851 aand 851 b may come into contact with the sliders 860 a and 860 b.Furthermore, the pushers 930 a and 930 b may come into contact with thelink brackets 951 a and 951 b.

If the second arms 912 a and 912 b have fully lain down with respect tothe base 31, the amount of compression of the first springs 841 a and841 b may have a maximum value and the amount of restoring forcesprovided from the first springs 841 a and 841 b to the sliders 860 a and860 b may have a maximum value.

If the second arms 912 a and 912 b have fully lain down with respect tothe base 31, the amount of compression of the second springs 851 a and851 b may have a maximum value and the amount of restoring forcesprovided from the second springs 851 a and 851 b to the sliders 860 aand 860 b may have a maximum value.

If the second arms 912 a and 912 b have fully lain down with respect tothe base 31, the amount of compression of the springs 940 a and 940 bmay have a maximum value and the amount of restoring forces providedfrom the springs 940 a and 940 b to the pushers 930 a and 930 b may havea maximum value.

If the second arms 912 a and 912 b start to stand up with respect to thebase 31, the second arms 912 a and 912 b may stand up using therestoring forces provided by the first springs 841 a and 841 b, thesecond springs 851 a and 851 b, and the springs 940 a and 940 b.Accordingly, a load applied to the motor assembly 810 can be reduced.

Referring to FIG. 87, as the standing up of the second arms 912 a and912 b with respect to the base 31 is in progress, the distance SDbetween the right slider 860 a and the left slider 860 b may graduallyincrease. Although the distance SD increases, the distance LD and thedistance RD may be the same. That is, the right slider 860 a and theleft slider 860 b may be located while forming symmetry based on thesymmetry axis “ys” of the motor assembly 810. Furthermore, the degreethat the second arms 912 a and 912 b of the right link 910 a stands upwith respect to the base 31 and the degree that the second arms 912 aand 912 b of the left link 910 b stand up with respect to the base 31may be the same.

As the standing up of the second arms 912 a and 912 b with respect tothe base 31 is in progress, the distance HD from the base 31 to the topof the display portion 20 may gradually increase. The display portion 20may be unwound from the panel roller 143. Alternatively, the displayportion 20 may be unfolded from the panel roller 143.

When the second arms 912 a and 912 b sufficiently stand up with respectto the base 31, the first springs 841 a and 841 b may be separated fromthe sliders 860 a and 860 b. Furthermore, when the second arms 912 a and912 b sufficiently stand up with respect to the base 31, the secondsprings 851 a and 851 b may be separated from the sliders 860 a and 860b. Furthermore, when the second arms 912 a and 912 b sufficiently standup with respect to the base 31, the pushers 930 a and 930 b may beseparated from the link brackets 951 a and 951 b.

The separation of the first springs 841 a and 841 b from the sliders 860a and 860 b, the separation of the second springs 851 a and 851 b fromthe sliders 860 a and 860 b, and the separation of the pushers 930 a and930 b from the link brackets 951 a and 951 b may be independentlyperformed. That is, the sequence of the separation of the first springs841 a and 841 b from the sliders 860 a and 860 b, the separation of thesecond springs 851 a and 851 b from the sliders 860 a and 860 b, and theseparation of the pushers 930 a and 930 b from the link brackets 951 aand 951 b may be varied.

An angle formed by an axis “xs1” parallel to the base 31 and the secondarm 912 a may be referred to as “theta R.” Furthermore, an angle formedby the axis “xs1” parallel to the base 31 and the first arm 911 a may bereferred to as theta R′. The axis “xs1” and the x axis may be parallel.

If the second arm 912 a has fully lain down with respect to the base 31or while the second arm 912 a stands up with respect to the base 31 orif the standing up of the second arm 912 a with respect to the base 31has been completed, the angle “theta R” and the angle theta R′ mayremain identical.

An angle formed by an axis “xs2” parallel to the base 31 and the secondarm 912 b may be referred to as “theta L.”. Furthermore, an angle formedby the axis “xs2” parallel to the base 31 and the first arm 911 b may bereferred to as theta L′. The axis “xs2” and the x axis may be parallel.

If the second arm 912 b has fully lain down with respect to the base 31or while the second arm 912 b stands up with respect to the base 31 orif the standing up of the second arm 912 b with respect to the base 31has been completed, the angle “theta L” and the angle theta L′ mayremain identical.

The axis “xs1” and the axis “xs2” may be the same axis.

Referring to FIG. 88, when the second arms 912 a and 912 b fully standup with respect to the base 31, the distance SD between the right slider860 a and the left slider 860 b may have a maximum value. Although thedistance SD is a maximum, the distance LD and the distance RD may be thesame.

When the second arms 912 a and 912 b fully stand up with respect to thebase 31, the distance HD from the base 31 to the top of the displayportion 20 may have a maximum value.

The aforementioned embodiments of the present disclosure are notmutually exclusive and distinct from each other. In the aforementionedembodiments of the present disclosure, elements or functions may be usedin combination or combined.

In the aforementioned drawings, the structure of the display device inwhich the display portion is rolled up from the inside of the housinghas been illustrated, but the present disclosure is not limited thereto.The present disclosure may be applied to the structure of a displaydevice in which the display portion is rolled down from the inside ofthe housing.

A display device according to an embodiment of the present disclosureincludes a housing, a flexible display having an upper surface, a liftassembly provided in the housing and coupled to the upper surface of theflexible display screen to extend the flexible display screen outsidethe housing, a motor provided in the housing and coupled to the liftassembly to raise the flexible display screen, and an elastic memberprovided adjacent to the upper surface of the flexible display screen,the elastic member configured to apply a vertical force to the uppersurface of the flexible display screen.

The flexible display may be an OLED display configured to be rolled andstored in the housing.

The lift assembly may include a left lever assembly provided on a leftside of the housing and a right lever assembly provided on a right sideof the housing.

The motor may be provided between the left lever assembly and the rightlever assembly and coupled to simultaneously raise the left and rightlever assemblies.

The left and right lever assemblies may include a first arm coupled tothe upper portion of the flexible display, a second arm coupled betweenthe first arm and the housing. The first arm and the second arm may befolded when the flexible display is fully retracted in the housing andthe first arm and the second arm are vertically aligned when theflexible display is fully extended.

The lift assembly may include a screw rod rotatably coupled to themotor, a pair of screw nuts in moveable engagement with the screw rodand configured to laterally move in opposite directions. The pair ofscrew nuts may be coupled to the left and right arm assemblies to raisethe left and right lever assemblies.

The motor may rotate the screw rod to simultaneously raise both the leftand right lever assemblies.

The upper surface of the flexible display may be engaged with theelastic member when the flexible display is fully retracted in thehousing.

The elastic member may have a body and a protruding member that extendsfrom the body.

The elastic member may be configured to extend a prescribed distancefrom a compressed state to an extended state.

The elastic member may apply the vertical force to the upper surface ofthe flexible display for the prescribed distance when the flexibledisplay is fully retracted in the housing.

An upper portion of the elastic member may be positioned inside thehousing when the elastic member is fully extended.

The elastic member may include a left elastic member and a right elasticmember. The left elastic member may be provided at a left side of thehousing to apply a vertical force at a left side of the upper surface ofthe flexible display. The right elastic member may be provided at aright side of the housing to apply a vertical force at a right side ofthe upper surface of the flexible display.

The foregoing embodiments are merely examples and are not to beconsidered as limiting the present disclosure. The present teachings canbe readily applied to other types of methods and apparatuses. Thefeatures, structures, methods, and other characteristics of theembodiments described herein may be combined in various ways to obtainadditional and/or alternative embodiments.

Certain embodiments or other embodiments of the invention describedabove are not mutually exclusive or distinct from each other. Any or allelements of the embodiments of the invention described above may becombined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of theinvention and the drawings and a configuration “B” described in anotherembodiment of the invention and the drawings may be combined with eachother. Namely, although the combination between the configurations isnot directly described, the combination is possible except in the casewhere it is described that the combination is impossible.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the scope of the principles of thisdisclosure. More particularly, various variations and modifications arepossible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

1-19. (canceled)
 20. A display device, comprising: a housing; a rollerlocated within the housing; a display panel comprising a front surfaceand a rear surface; and a plate coupled to the back surface of thedisplay panel and comprising an opening, wherein the display panel andthe plate are wound on the roller.
 21. The display device of claim 20,wherein the plate comprises a metal material.
 22. The display device ofclaim 20, wherein the plate comprises a plurality of openings arrangedin a plurality of rows which are aligned along a longitudinal directionof the roller.
 23. The display device of claim 22, wherein the pluralityof rows are separated by rows of plate material each having a sameheight, wherein adjacent rows of plate material are connected by bars ofplate material separating the plurality of openings.
 24. The displaydevice of claim 22, wherein: the plurality of openings are elongatedslits; and a first length of a first opening of a first row of theplurality of rows is greater than a second length of a second opening ofan adjacent second row of the plurality of rows.
 25. The display deviceof claim 22, wherein sizes of openings of a first row of the pluralityof rows are the same as sizes of openings of an adjacent second row ofthe plurality of rows.
 26. The display device of claim 22, whereinpositions of openings of a first row are offset with respect topositions of openings of a second row adjacent to the first row suchthat adjacent openings of the first row are separated by plate materialwhich is vertically aligned with a center of an opening of the adjacentsecond row.
 27. The display device of claim 22, wherein: the pluralityof openings are elongated slits; a first opening disposed at an end of afirst row of the plurality of rows is open-ended toward a lateral edgeof the plate; and a second opening disposed at an end of a second rowadjacent to the first row is open-ended toward the lateral edge of theplate, wherein a length of the first opening is greater than a length ofthe second opening.
 28. The display device of claim 20, wherein theplate further comprises a plurality of openings arranged in a pluralityof rows and forming a pattern such that corresponding bars of platematerial between corresponding openings in every other row of theplurality of rows are vertically aligned.
 29. The display device ofclaim 20, wherein: the plate further comprises a plurality of openingsarranged in a plurality of rows; positions of openings of a first roware offset with respect to positions of openings of a second rowadjacent to the first row; a first bar of plate material between a firstopening and a second opening of the first row is vertically aligned witha second bar of plate material between a third opening and a fourthopening of a third row, wherein the second row is between the first rowand the third row.
 30. The display device of claim 20, wherein the platecomprises a plurality of openings arranged in rows, wherein each of theplurality of openings is rectangularly shaped.
 31. The display device ofclaim 22, wherein each of the plurality of openings is an elongated slitformed to be elongated in a direction parallel to the roller.
 32. Thedisplay device of claim 20, wherein the rear surface of the displaypanel and the plate are coupled via an adhesive layer.
 33. The displaydevice of claim 20, wherein the plate and the display panel are wound onthe roller in a direction such that a rear surface of the plate ispositioned toward the roller.
 34. The display device of claim 20,wherein plate and the display panel are wound on the roller in adirection such that the front surface of the display panel is positionedtoward the roller.
 35. The display device of claim 20, furthercomprising a first resin layer disposed at a rear surface of the platewhich covers the opening of the plate.
 36. The display panel of claim35, wherein: the plate comprises a plurality of openings which arealigned along a longitudinal direction of the roller; each of theplurality of openings is an elongated slit formed to be elongated in adirection parallel to the roller; the first resin layer is flexible andconfigured to be wound on the roller; and each of the plurality ofopenings is filled in by the first resin layer, wherein the plate andthe display panel are wound on the roller in a direction such that thefirst resin layer is positioned toward the roller.
 37. The displaydevice of claim 35, wherein the first resin layer is configured to coverthe entire plate such that the plate is not externally exposed.
 38. Thedisplay device of claim 35, further comprising a second resin layerdisposed at the rear surface of the display panel, wherein the plate isdisposed between the first resin layer and the second resin layer. 39.The display device of claim 35, wherein the first resin layer comprisesa urethane or rubber material.